I recommend just signing up for another instance or five.
IMO, there's really no reason to "move" on Lemmy. If you see an instance that looks interesting, sign up for it. Spend some time there and poke around and see how it's different (they're all at least subtly different, since they all have different sets of federated instances and subscribed communities). If you see another one that interests you, sign up for it too. Keep going like that and eventually you'll find yourself settling into one or maybe a few not because you took a guess or followed someone else's recommendation, but because they simply turned out to be the ones you liked best.
I have no idea how many instances I've signed up for over the last couple of years - a couple of dozen at least. Of those, I generally have three or four that I use the most, though the specific ones have changed, as some of my earlier favorites have gone notably downhill or have shut down and new favorites have arisen.
All that said, overall I've been most satisfied with this account - Sopuli.xyz. I also spend a fair amount of time on dbzer0, lemm.ee and Fedia.io (which is notable because it's not Lemmy, but mbin, which is an entirely different piece of software that offers all the same basic functionality of Lemmy, but is formatted a bit differently, and in many ways is actually better than Lemmy). I have a .world account, and in fact it's my oldest account, but I find myself using it less all the time.