If we are talking about a simple platform to make announcements, you don’t need interactivity. That means you can go with the simplest option of all, which is in my mind a blog. I don’t know what your web hosting setup is like, but if you are running a vps you could configure your web server software to serve up a blog on a subdomain. Other than the issues with the ml TLD your site seems to have remained stable and available (unless I have just missed it going down). I’d reccomend Jekyll for its combination of simplicity, light weight, zero overhead and ease of use.
Is there a criteria I am missing or misunderstanding? Or a feature of your hosting setup that makes this not doable?
Edit: that might come across as pushy, which isn’t my intention! Even if it is doable with your setup I obviously have no place trying to demand that you do it, so please don’t take it that way
So it sounds like money might help then? I could also pitch in a little, I don’t mind giving back some if you’re willing to maintain the instance. $100 is a pretty low bar to reach. If you are interested in maintaining this Lemmy, then perhaps spend a little time to plan out what resources you would need. Be it volunteer efforts, research, or cash. The community may well step up if you make a post detailing your needs.
Of course, it is entirely reasonable to discontinue the instance if it is too much of a headache or no longer what you prefer to do! I’m just pointing out that if you can present a clear concept of the help you need, you may find that it is available.