The below is my personal wishlist. I fully understand it’s a long way to implement all of that. Everything is to be discussed. Correct me if some items from this list are already in the roadmap or have been implemented.

• private communities
• more granular permissions (say, a user can or not to comment, to create posts, to vote etc.)
• site-wide recent activity list (all posts/comments created in communities you follow)
• pinned posts/comments (not only a single post/comment, but multiple ones)
• bookmarks
• being able to see who voted for/against a post/comment
• (controversial) being able to super-vote in a community (in case of having a certain permission in this community), say, to add 2 or more votes to a post – this is similar to reacting with “super” on Facebook, to me, it equals to adding more than one like
• more mobile-friendly header (like Raddle, for example)
• tags for posts
• tag rules with a popup when adding a tag (like Dev.to)
• tag moderation
• option to restrict tags in a community to only those from a predefined list
• community rules link or an except with a link when creating a post
• oEmbed for links
• more profile contacts, so that a user can put not only a Matrix contact in the profile but also, say, an email or a Telegram contact – basically, just being able to add additional fields that if a field contain a link, the link is highlighted, and if the link is one of the known ones, a nice email/Telegram/Facebook/Mastodon etc. icon is shown along with the link (the other fields can be without links, like pronouns, profession, hobbies etc.)
• integration with an event provider (say, Mobilizon) – keeping the same permissions, so that a community admin/mod can create events only visible to the members of the community
• integration with a chat provider (say, Matrix) – keeping the same permissions, so that a community admin/mod can create one or more chatrooms for their community
• well, federation
• a mobile app (a big thing and a long-term goal, I know)