A season full of aspiring actors trying to play a character would be so good. They'd have to only have a general idea of Fishtank though, no fans.
Start with like 15 people so all the early walkouts don't harm the vibe. More people equals more content early on on anyway, which is a good thing. We'd only start to get to know them as people about halfway through when the characters are completely cracked, which would keep people watching even in the lulls of the late season.
It also would keep peepee poopoo tank from happening so early and blowing everything up.
One of my favorite parts about S3 was the restraint of the TTS for the purpose of the "AI House" narrative (sans a few "J"s lmao) and how it slowly broke and devolved right before the reveal. They should go for the same sort of thing again. Hearing someone be called a faggot on day 1 is funny but wears out within a couple weeks. There was so much more potential with the fake AI, it would be fine to reuse it.