I do have a question: Do you like your current desktop environment (Cinnamon)? Some newcomers complain that it looks quite dated (which I agree). If so, you could try out KDE Plasma or GNOME instead.
You can use Shizuku with Canta. You can pretty much uninstall any app that way (even system apps), but you of course can also brick your phone if you aren't careful. There are builtin warnings for critical system apps that will brick your phone.
I have not been convinced lemmy.world being the largest instance is actually a bad thing. It’s bad for federation, I suppose, but they’re all Redditeurs and I appreciate having a containment zone for them.
Most people here are from reddit or other centralized and enshittified platforms such as Twitter.
LW got recommended often and it created a snowballing effect, which is why it became the biggest lemmy instance. Unfortunately people keep doing it and LW admins refuse to close down their registrations temporarily to allow other instances to get some traffic as well. That's why some people (like me) advise people (like you) to stop recommending LW over other instances.
And LW is not a "containment" zone for former redditors.
I don't recall mentioning that PeerTube could replace YouTube in my comment.