>Introduce the characters, introduce Charlie and tell SHOW us who she is. Introduce a problem, in this case, the extermination. There was a strong starting point we could've had focusing on the Extermination alone.
>Immediately open the show to blood, screaming, murder, etc. Show confused demons pleading for their lives and the such. Have it be a mystery who kills them and why until it flips back to Charlie. Have her go out and experience the sudden death, murder, and chaos and have her stand alone in the environment. SHOW the audience this scene of savagery and the injured demons trying to pick themselves back up. It could even foreshadow some of the Overlords here and give us snippets of them reacting calmly/furiously. It would establish the many different sides of the characters, give us a basic grounding on the issue that we can put 2 and 2 together, and then have the scene end with viewers wondering, "Why?". Who just killed all these demons, and for what purpose? Was it another demon? Maybe the Angels? What made them do that?
We need single-character focus and development before we watch them all work together. The fact that we're only four episodes in, and we already have characters like Husk deadpan explaining the characters and their flaws to us is ridiculous.
"Vaggie hates herself!
"Charlie focuses on everyone else's problems but her own!"
"Nifty is Not Like The Other Girls TM!"
...You couldn't just SHOW us this through the story? And she wonders why people compare her work to fanfiction.
We need more time to know and understand these individuals and their motivations, goals, etc.
Hazbin Hotel is doing the opposite of "Show, don't Tell". It seems she has no faith in her viewers to understand a show with even a hint of a complicated storyline. She pulls inspiration from a show like Bojack Horseman but can't understand what made it good. It's like she thought all the surface-level pop-culture jokes were the show and completely missed his down spiral of shitty behavior that couldn't be forgiven and how they affected everyone else, along with his more human traits. Bojack had a shitty life all around, from his abusive father to his neglectful mother to a myriad of other things.
Instead, she could've even gone the episodic route with a hint of a story. An episode of the characters interacting and building rapport with one another. Episode X is about Husk and some of his deeper complexions being a gambler and how it began. Episode Y is about Angeldust, his issue with Valentino, and where it all began. Episode Z is about Vaggie and why she possibly hates herself & shows her self-doubt and insecurities.
All of these are sprinkled through more lighthearted episodes about the hotel, perhaps showing some of the culture of the immediate hell right outside, the lore of the hotel itself and who used to own it, Charlie's relation to the people of hell, why Charlie is so sheltered, how she met Vaggie, having sweet moments between the two, and much more. Then, in another season, introduce DickMaster(TM) and Heaven after the Hotel makes REAL progress. Show the blood, sweat, and tears that went into making these rascals slightly better people and have a real case to pitch.
Make meeting Adam a BIG deal that had to be earned and then have it taken away. All her work is for "nothing," therefore adding conflict. Then Charlie could have another spout or lash out that her hard work is being undermined. Adam could then give her a vague threat about how lucky she is to be alive. It could even add some actual manipulation and say that BECAUSE of Charlie's actions, the subsequent extermination would be sooner (when, in reality, someone killed an angel, and the council already decided to make it sooner. It would add more contention to Charlie's character and leave the audience saying, "No, Charlie! It's not your fault! He's lying!")
What do we even have to root for Charlier so far? Why should we even care that these terrible, horrible, no-good, very bad demons deserve redemption anyway? Other than being "UmU sad beanbois with le tragic past," why should I care if Husk or Nifty were to be exterminated? What redeeming qualities have we been presented with that show us these guys have more than meets the eye other than daddy issues? What should compel me to feel bad for murdering, cannibalistic, raping, sociopathic, narcissistic, self-centered, drug-addicted Oncelers and Wardens? Because they're cute? Happy Tree Friends already did that ages ago.