A few days ago I posted the same question on X, Bsky and Mastodon. I’ve received more interactions and responses on Mastodon than the other two combined.

It’s not a self-hosted but I think that Image Toolbox (https://f-droid.org/packages/ru.tech.imageresizershrinker/) meets your requirements

I Used Gondolin for my PC but after reinstalling I didn’t put it back on and left the default

I like more Org Mode but I know that Markdown now is more universal. But… The best of both formatos is that I can use any plain text editor for read and editing it

I thought about using friendica, but I wasn’t convinced to use it. NodeBB I think it’s a good option to create a forum, but not for what I’m looking for. Thanks for the suggestion

After seeing a bit of GotoSocial I think it could be a good solution for what I need. Thanks for the recomendation