I like xmpp, but it is not a discord alternative. It is a WhatsApp / Signal / iMessage alternative.
It doesn’t have 80% of discord features, I use discord a lot and I don’t have a single group chat.
Matrix / Element is a way better alternative feature wise.
Not exactly what your are looking for, but mihon (formerly tachiomy) fixes my webcomic need. It is both a reader and a downloader. You have different scrapping extension for many sources, thus you can pretty much find anything. If you are fine with a (android) phone only workflow, I recommans you give it a try.
https://www.gog.com/de/ https://en.wikipedia.org/wiki/GOG.com
GoG is a DRM free game store