The question is less about whether or not you'll ever go back, imho, and more about how much time you'll be spending going forward looking at their ads, and whether or not people will continue to submit new content; just browsing their existing content isn't nearly as useful to them for their new beloved, those large language model suitors. To wit: If you want to ensure that the message is heard as loudly as possible, don't give them any content that the LLMs would find useful enough to pay Reddit's exorbitant API fees. (That includes up-votes/down-votes, not just commentary.)

If you also still need to refer back to things there occasionally, I suggest installing an ad blocker and just not using their mobile app at all. If Reddit goes through with their notion of blocking mobile browsers... so be it; that just means you should spend your on-the-go browsing time all on kbin/lemmy sites, and only refer back to Reddit when you have a chance to sit down at a desktop computer.

Just my random thoughts, though... take them for what they're worth.