I maintain https://github.com/awesome-selfhosted/awesome-selfhosted :) Reviewing additions takes some time but it gives a good insight on new releases. You can check the list of Pull Requests/software being added here

There is also a third-party tool that tracks newly added software.

I’m self hosting wefwef, an Apollo-like, platform-agnostic Lemmy client.

Unless I'm actively looking for a specific type of application, or to replace one I already run, I just check in on the subreddit periodically, just looking at the top posts from the past month or so.
I guess I'll start checking in on lemmy now.

There was a time, where I was checking for new stuff to selfhost almost daily. But at this point, I have what I want, and there is no point in trying to change a running system.

I like to listen to the Self-Hosted podcast together with all the Late Night Linux family ones. That keeps me up to speed 🫶