Just make accounts wherever and stick with the one that you like the most tbh. That’s the beauty of the fediverse, the many options can seem daunting but you don’t have to choose one! I have this account to interact with lemmy.ml directly, I have a blahaj account to interact with the wider fediverse while getting transphobes and the worst of the reactionaries filtered I have a hexbear account to interact with hexbear. I like the hexbear community the most, it’s probably the most one that is a community within itself with multiple sub-communities but it’s of course a matter of taste. The most choice you get from lemmy.zip I believe which is the most widely federated one and stays out of drama. There is dbzer0 the more anarchist oriented instance. Lemmy.world is the most reddit one I feel like both in tone and moderation. But just make acounts wherever it doesn’t matter.
Not entirely true, you can still see post and comment histories on instances that federated with lemm.ee for instance my old lemm.ee account @mathemachristian@lemm.ee