I'd say that your best bet is FreeTube, which got ported to Android back in 2020. I've only been using it for a few weeks, since I only got ahold of an Android device this month, but it has never let me down.
It's available on the IzzyOnDroid repo, and as an APK, so you can install it with F-Droid or Obtainium (or manually).
That's Bluesky. It's supposed to be a federated social media, but right now there's only one kind of software for it and you can't yet self-host it (although you can self-host your data). The open-source protocol, known as AT, was created by Twitter back in the day, and Jack Dorsey and a bunch of staff were able to rescue it when Musk took over.
AT does not federate with ActivityPub, but users of either protocol can appear on the other using Bridgy; and some Friendica instances have basic support for AT. The equivalent of "fediverse" is "ATmosphere" (with the first two letters capitalised).
Since it became public (as opposed to invite-only), Dorsey left the platform and went back to Nostr (yet another microblogging platform, this time built around blockchain :-P).
It's actually quite a nice place, in my opinion, with a vibe similar to a combination of Twitter and Tumblr.
Sorry for going into this much detail. I just really like explaining things.
EDIT: Turns out, the word being thrown around in place of "tweet" was also slang for cum. I have removed it, as this was probably originally a joke.
I haven't touched my YouTube channel in over a year now, but at this rate I'm thinking of deleting it altogether. There doesn't seem to be a PeerTube instance willing to host all of my content (it's essentially an archive for old PSAs, with occasional top 10s), so I reckon I'll download the entire channel with JDownloader and then wait until I can host an instance of PeerTube or MediaGoblin.
To be perfectly honest, I think your best bet is to learn a programming language, get a few programmer friends together, make an account on Codeberg, and do it yourself.
Of course, there's always a chance that some fuchsia-based OS will become available for phones, but I think most people are focusing on Android ROMs and Linux phones at the moment.
...except NewPipe doesn't work.