I think it would be better if we have better integration across the fediverse, including integration between Mastodon, Pixelfed and Lemmy.

I know that Mastodon doesn't really have communities, well, Mastodon has hashtags, which come close but are not really the same. Maybe when viewing a mastodon instance from lemmy, it just creates a pseudo-community ("/c/all@mastodon.instance") for each instance that you can browse and subscribe to from lemmy? This way, there would be more content and you could more easily interact with other parts of the fediverse without needing to create multiple accounts on multiple services.