A big part of the problem solves itself with a larger userbase. More content generated, more exposure, search engines show lemmy instances in results, people learn. Lemmy is not that hard to undestand. You can join an instance and explore from there, maybe stay within you instance and be satisfied by your experience. Maybe you'll learn in time about other communities in other instances. When I first joined reddit 10 years ago I didn't understand it either but I kept using it because it was interesting. What I propose is that we keep making content and commenting and that will attract more people and communities will grow.