Have a look at !newcommunities@lemmy.world . Sort by top if needed and especially this post

Edit: and I also learned about !wowthislemmyexists@lemmy.ca

I used to sub to new subreddit via such subreddits, or in comments of posts that showed me through a discussion. Or sidebar of subreddit on related ones.

right I was just testing it and it auto fills with absolute path using “!”. Using “@” I could only link local communities

I wish someone or a dev could make this list in these website and propose lemmy/kbin equivalents for us the redditors to join instead. On the other hands mods of those subreddits if they want they can make a community over these platforms.