Better discovery.

Better way to federate images.

Link similar groups together.

More elegant cross posting.

Ability to filter by human comments rather than by posts or comments from robots.

Better onboarding, support OAuth, Fido 2, authenticating with a third party service such as Google Microsoft Facebook GitHub etc

Dynamic links to posts, like we can do bang links to communities.

More community moderation tools, such as requiring moderator approval for public posting.

Requiring community-based karma before you can make a public post in a community.

Brigading defense for smaller communities