I would feel okay i think. I only use it when it ends up in my search engine answers, and i think it’s okay, it has both a larger userbase and older history, so for niche subjects and specific questions it makes sense to use it.

But if you feel bad about it, maybe consider creating the communities you would like to see on Lemmy, as others said ! It may be not as hard and time consuming as you think, especially if you find some people to help you or even to entirely transfer the moderation part.