It would be possible to federate a list of all communities on a remote instance, so you could browse that. But probably only the community name and profile, fetching posts/comments could use a lot of resources.
Lemmy
Everything about Lemmy; bugs, gripes, praises, and advocacy.
For discussion about the lemmy.ml instance, go to !meta@lemmy.ml.
What happens if I just browse "all" on my feed. Then I'll see posts to subs on other servers when they come in, right?
Yes, you can also change your settings so that it shows 'all' by default
Yes but it'll only show content for communities that have already been subscribed to/searched for from your instance
Hi, I had this problem on my instance since I'm the only user. I found a workaround to get all lemmy.ml communities to show up on mine, I posted about it here: https://lemmy.coupou.fr/post/10428
This problem seems similar to the discovery problem small Mastodon instances have.
On Mastodon some folks have created bots that follow new users on other instances automatically, which half of the mastodon fediverse found very annoying.