You should know that you can use https://lemmyverse.net/communities to search for the most active communities on a topic
Pointing this out as I noticed in a few comments that some people where not aware of this tool
Also, you can configure your home instance with the button on the right to access a community being logged in: https://sopuli.xyz/pictrs/image/bb8c3d8d-a860-4f20-828c-61c3a1cd49c8.webp