If I have one piece of advice, it's not to learn anything. Years ago, I learned the actual meaning of "begging the question" and have been tormented by how other people have said it ever since.
Twitter learned, and Reddit is fast learning, that people are not addicted to the platform, they’re addicted to the community they found there. Ruin the community, and people will leave the platform. It really is that simple.
One good thing that could come of this is that maybe I won't even have to choose, there will surely be clients that will let me manage accounts on both mastodon and bluesky