I left Twitter because it's a total cesspool of hate. I left Facebook for many reasons years ago for the same reason. I'm on Threads, because it was a nice place to follow my interests, but recently there's been more bots and plagiarism on there. It's very left-wing, more so than sits right with me actually.
Another problem with Threads is if you have a private Instagram account (which I do) your Threads account is also private and that's maddening because you can't take full part in a discussion. I might leave soon.
I don't want to join BlueSky because not many people on there have the same vibe as me. The same hateful people, either left, centre or right of politics follow each other to platforms and continue to spread their vitriol wherever they go. Telegram, Mastadon, all of them are awful, actually.
I'm in my late 40s and unfortunately SM is beginning to pall for me. All these platforms peddle nonsense and tell you how to think, baiting you to feel outrage over something for phishing for information. The grass isn't necessarily greener on a new platform. I feel mentally better when not on them, tbh.
I might just stick with IG as a private account (IG is a fantasy world too, always trying to flog you something, or tell you your life is shit unless you DO THIS) because I share photos of things I'm doing with family members. It's my online photo album. The rest of IG is bollox, tbh.