You don't have to switch, its like email, you can just have multiple. The phone apps for lemmy have an account switch feature so you can use more than one. The sign ups aren't much more difficult than worlds in most cases. Some require a manual approval which can take some time.

Personally I left world because of how antagonistic they are towards vegans. I don't mind a good debate but its crazy to me that the majority opinion there is that veganism is about as taboo as child rape.