Yeah... it is a little overwhelming when just dipping your toes. In the initial push to get off of reddit I ended up with a lot of accounts... Beehaw, sh.itjust.works, fedia.io, kbin.social, readit.buzz, infosec.exchange, infosec.town, defcon.social, tildes, squabbles, etc. At some point you just have to use something.
If I had to guess what I'll be doing in the future, I'd say it will resemble reddit where I had multiple accounts for different purposes but not different platforms, just different content filters and topics. Eventually there will be at least one app that works with both Lemmy and Kbin accounts and make it all more or less seemless and arbitrary.
Right now I'm primarily using Kbin and Beehaw, I don't know which account will eventually be more important to me. I'm also using Ice Cubes for Mastodon with a couple different Mastodon accounts. What would push me all-in on a kbin instance would be if I federation between Lemmy instances and mastodon instances reached a level of functioning that didn't feel like I was missing anything. I'd rather not have a million different apps and accounts just to see different versions of the same shit.