Same here, I will occasionally use reddit while Apollo is still up, but once it shuts down I’ll stick with lemmy, at most browsing old.reddit.com if I need to search for something specific
PowerDeleteSuite creates a csv file with your deleted posts and comments, and using it is pretty simple
It depends on how many communities migrate from reddit to lemmy. I will definitely not return to reddit on mobile once third party apps are shut down, but if reddit changes their stance and third party apps come back, I may go back if most of my communities haven’t migrated to lemmy.
If you’re willing to pay for a search engine, I highly recommend Kagi. I’ve been using it for a few months and I like the results better than Google or any other search engine I’ve tried.