People should study the decline of Rome, the Byzantine–Ottoman wars, and the Weimar Republic. The problem is that a little information leads one to fanaticism, and further study sobers them to a more rational pessimism about America's continued preeminence in the world. The Ukraine War, even if Russia outright somehow annexed it, is infinitely less important than Putin and MBS being friends. I'm sorry to the TV Watchers, its true. However the Greater American Empire is also not America, so let it die. Its funny when it fails because nobody loves it, and nobody should.

There are no adults in the room, diplomacy from America is ideological rather than pragmatic. Realpolitik is needed if you are going to rule the world, and thank Jesus Christ America cannot manage to rule longer than it has. Europe mocks the American for their government's lack of social spending, because the American Tax-payer funds European defence instead. Don't, and see what happens to American Social Programs and European Social Programs. Don't.

China has an aging population, and growing social disorders. The Communist Party has lost the Mandate of Heaven culturally, and the result is that China will either bloat into a world empire extremely quickly to ensure domestic standards are raised or far more likely will not even be able to conquer a few minor islands about Taiwan (never mind Taiwan itself). Its population is ridiculously all about the same age because of the Great Leap Forward's birthing program followed by the one-child policy, and its aging quickly. There is a temporal bomb built into the foundation of Commie China and there is no way to disarm it. That was before the fertilizer issue, and while they've stocked up on food there is only so much and the glorious CCP wants to use it for diplomacy. Which will work wonderfully and China will seem to grow first in all the world during a terrible famine, until their stores run out and their populace eat them alive.
Russia cannot manage to grow its infrastructure nor quell its corruption. Putin thought the troops were at full strength because whenever a report about counts came in, it summarized that recruits were found so the troop strength was therefore 100%. They never were, a signing bonus was split between the recruiter and the now-unsuitable recruit. Even the elite paratroopers were under-strength in equipment and personnel. Captains sold ship parts to buy Vodka. Maintenance in Russia is like Logistics was in Nazi Germany. Not enough, and then suddenly it stopped.
The world isn't going to invade America, America is going to falter into Imperial Exhaustion financially. Let the world fuck up, it will make America seem nicer than it today seems or truly was.
Liberal Democracy is being revealed to be a lie of consent manufacturing by oligarch newspaper owners, and even Null thinks we should buy ammo on election day rather than vote because it would be far more meaningful statistically to Washington DC. However unions are just going to be churches for wokies that let the unrepentant be punished by management, and the Far-Right are successfully being kept from acting up in fear of everyone being given the Jan 6th treatment. The Far-Right cannot win without women, and AF isn't going to change.
There are no political solutions.
Do not vote for the two major parties, lie and vote third party if you must but they'll never win. Donald Trump is not anyone's friend, he just knows how to use the right's buzzwords. He doesn't mean them. It may come to pass that the election in 2024 is as fortified for the Republicans as they say it was for the Democrats in 2020. He isn't going to help you, and he will use the police on you. No wall is going to be built, no one in the Trump camp is going to save you. You likely will fall for him again if you did the first time, and I forgive you your stupidity for I am the same.
However stagflation is not hyperinflation and while it could become bad, due to the petrol-dollar being the primary value of the USD rather than industrial exports, it likely will settle down perhaps even with a collapse of the Housing Market. Reality has long been suppressed, and people might be able to afford a home outside the megalopolises. America has a population density of 94 people per square mile. Europe has a population density of 87 people per square mile. 90% of Americans live in cities, 75% of Europeans live in cities, and 56% of the world live in cities. This has to stop, its sterilizing us.
America has to work with regional powers, it must reduce its military footprint, and then it has to turn its energy, fertilizer, and steel industries inward towards local and not global output. There is going to be a famine. Again. there is going to be a famine. However America is a net exporter of food, and yet that is going to be hurt by rising demand causing local prices to compete with global bidding for wheat. Also fertilizer, in about three different forms, are each and all going to be hit with shortages. America is going to become unrecognizable in 2030 compared to today. Whether that is because the large political parties bent to the prevailing necessities or because they were swept aside for those that would, it is tough to say. One of the greatest factors in whether the Democrats and Republicans make it is the absolute floor of the economy during the 2020s.
If the worst should happen, Onlyfans will not save you and neither will NFTs. Good investments are those that both grow and allow you to sell them for USD in your ideal scenario. With a depression your ideal scenario means will your pussy and jpegs during harsh times be worth buying from you? Will people worried about food hand you USD for your investments? In the Weimar Republic this left prostitutes with three choices.
Side with Liberal Democracy and try to find a job where you don't suck dick for tinned meat. All the men secretly, or not so secretly, hate you and want to fuck you but cannot afford to continue to pay you what you got before from the entire world.
Side with Communism and their belief that Sex Work is just like any other work but doesn't qualify you for any other work. The revolution might need many things but a whore just wasn't one of them.
Side with National Socialism, point at the nearest Jew, and tell the Nazi they put you up to it. Nazis historically instantly forgave such ladies for how was a woman to know better? Marriages and children later, they stood in bread lines until a bomb took out a few and the ones down the line walked forward replacing them and reforming the queue.
You can see why the fascists said the women were their greatest allies after the Great Depression and how they got significant power in the July 1932 German federal election thereafter. When President Paul von Hindenburg appointed Hitler as Chancellor, he immediately urged the dissolution of the Reichstag and the calling of new elections. On his second day as Chancellor, Hitler opened his campaign with a nationwide radio address pledging to save the nation from the left-wing, which he castigated as "political nihilism." The rest is history.
However the likelihood that a Hitler would capture the failing industries of decadence, blaming a minority for it, and ride the resulting wave of populism to political office is small. Far more likely a third party would merely pair oligarchs looking to control the next American Economy with workers looking for a house/spouse from proper employment during a recession/depression. America would come out looking far more militant, patriarchal, and banana republic. But if the economy stagnates or hits resource shortages then a Junta/Red Terror state of fear could be a possibility. Whether America would moderate out, collapse into a civil war, or look like a late USSR heading for balkanization is hard to say for sure.
TL;DR If you want doom and gloom, study the Bronze Age Collapse, the Brezhnevian Stagnation, or the Spanish Civil War I think those match what's coming for the West better.