This has been recommended numerous times to him (at least on KF, not sure about his own fanbase).
One suggestion I specifically remember presenting on here myself was that he do "cooking with the king" in livestream format (which is allowed by Twitch). He could set up his cam in his kitchen and literally do subpar cooking live on stream and he'd probably get tons more money than he does playing any actual video game.
If DSP did a "cooking with the king" livestream every two weeks he'd easily rake in actual money, because people find his inability to cook food far more entertaining than his inability to play video games. He could easily try out new recipes every time he does the event, and the cooking ingredients would probably cost less than any new video game he'd just play for a few hours and wagequit.
It'd even be funnier if he set a tip goal to buy some stupid expensive ingredient like live lobster, bluefin tuna, kobe beef, horse or something similar which people would pay towards just to see him fuck up.
if he tried it, it would only be things he already makes
it would be bland and boring (SO I JUST PUT THE TURKEY BURGER IN THE MICROWAVE OKAY?!)
then he'd cry about not making enough money to keep doing it (I NEED LIKE 65 DOLLARS PLUS TAXES, SOUND GOOD?!)
and if he fucked up in the slightest his ego would get hurt and it would be no go forever
and if he didn't like the new thing, it'd turn into an hour of him bitching about the wasted money, and how he's hungry, and now khet has to run out and get them food, and the trolls are trying ot starve him, and how it doesn't have 40 cups of sugar so it's stupid.
also kat wont want to be the living tripod all the time, so he's either going ot one hand it or put the camera on a counter and we couldn't be able to see shit, because buying a tripod is too much
and he'll stop to read chat every 10 seconds, probably burning something in the process and blaming the chat for it
It has also often been suggested that he do a sort of "call in" radio show where he discusses contemporary social and political issues. If not that, then a live "gaming news" sort of show...
discussing political issues, he would just read headlines and go "HMM SO THERE" or if it's more humorous "NUHUHUH" occassionally making a "JUST LIKE MUH DETRACTORS ARF ARF ARF ARF ARF!"
and if there's a hint of racism "WHEW GOOD THING IM MORE MATURE, OKAY?"
gaming news, again he'd just read headlines and either bitch about someone, bitch about something, or HMM SO THERE... and then go off on a rant about how people are stupid and buy into hype and how he's the REALIST STRIMMER and how other STRIMMERS are fake.