I've been thinking about switching over to lemmy.today as it's not currently defederated with anyone, so I can decide who to block and keep for myself. It's based in Oregon, and I like the idea of joining an instance close to me. I do worry about Lemmy.world being so overly dominate in the federated-lemmy-space.
But many of the communities that I participate in are lemmy.world, and it's nice that they send me an automated notice whenever a post/comment of mine is removed. I've already subscribed to many communities and would have to do that all over again. and I haven't thought of a creative new username.