As an immigrant from reddit myself, the multiple instances and where to call my home was the first big hurtle by far. With that, my biggest concern was if the instance I was joining was going to allow me to see everything in the fediverse since instances can be blocked.
Right now I have a kbin and Lemmy account. Because although the Lemmy account I'm on isn't being blocked by anyone, I'm finding it difficult to find some instances where on kbin the same search yields the results I'm looking for.