I did this. I didn't initially realize there is such a thing as instances (I thought I was joining Lemmy). Came from Reddit so didn't expect this. Now I only use my Lemmy.world account, the other one is doing nothing (should probably get around deleting it at some point).
So far I've created an account at sh.itjust.works (first one), lemmy.world (main during most of my time here), lemmy.dbzer0.com (first attempt to migrate to another instance) and at lemm.ee, because I wasn't happy with how lemmy.world admins run their instance (preemptively defederating Hexbear but not Meta).