Three including this one, but the other two were just created on other instances before I settled for one I actually liked. So they are more like dormant accounts I log into every other month or so, I don't actively use them.
I started with just one on Lemmy.World, but then like a month after the Appocalypse when the server was being hammered and someone pointed out it could be lessened by simply using other instances, I made two more. This one on Yiffit.net which became my main, and one on "shit just works," just in case.
I sometimes get on the Lemmy.World one for mod reasons, but I haven't actually ever used the shit just works one.
Started out with lemmy.one, then when they had major downtime, I started on kbin, but when I couldn't use that with my preffered lemmy app, I spun up lemmy.world which is now my main.
I have a four, but most are from instances I've moved away from.
Started on Beehaw but when they started defederating from everyone I made a programming.dev account.
Also created a personal instance, but it was too heavy for my NAS to be worth it.
Finally, an Mbin account recently because the communism stuff from the main developers seems to be pretty contentious right now and I want to explore alternatives while I'm still happy with Lemmy. If some "event" happens and I find the need to move somewhere else its good to have an alternative in the pocket
Two. My original account on slrpnk.net and this one I opened on midwest.social when I realized the community I wanted to start was off-topic for the other instance. I use both interchangeably, but this is my main.
I created my original account on sh.itjust.works. Then I found out about lemmy.ca so I created a new on there. I try to keep them both synchronized in terms of subscriptions.
Just one. Technically, it's this one. My "main" account is my kbin.social account, but it's so frequently having performance issues that I've been using this account almost exclusively for a while now.
Used to have two, one in beehaw and one on sh.itjust.works, but then drama happened and I decided to embrace the owo. So nowadays I just have this account and a secret other account for posting cringe.
Was originally on lemmy.ml but made one on beehaw because it was overloaded, after a tankie ban on lemmy.ml moved to sopuli.xyz, I also have an account on lemmynsfw for... stuff...
I made an alt on each of the big instances, because I wasn't sure which one I wanted to use long term. Then I just kinda stuck with them, each following slightly different topics, and therefore having different opportunities to participate in discussions.
Just @KaneLivesInDeath@lemmy.world as encouraged by instance admins because they said moderation of !casualconversation@lemmy.world would require multiple names to catch all the mod reports, but then the community moved locations to its present location to accommodate to certain people from the Southern hemisphere who would otherwise no longer be able to use it via whatever they have going on here instance-wise, so here I am stuck with an alt named after some guy from Command and Conquer.
Techically one. The only reason I am using this one instead is because I forgot the password for my other account, neidu, some time last year. Plus it was on an instance I grew fed up with.
I have an account on kbin.social, lemmy.world, and sh.itjust.works. They are all linked on my respective profiles. I mainly use this one because .world had some issues where I couldn't view comments on the connect android app about a year ago so I just switched. I like the app interface because it reminds me of rifgp, so that's why I've never given kbin a fair shake.