Finished series and runs are nicely archived as packages often, but figuring out the search terms and issues over Annas Archive seems like nightmare level confusing. Since there are so many issues and multiple runs etc.
Are there more organized indexes or feeds to follow or should I just find official issue lists and search by one by one?
Mihon and several forks are still actively developed and both extension repos, one of which being Keiyoshi, are also still actively maintained. Where are you getting your information? Might want to stop listening to whoever is telling you this.
For OP: you could try something like xoxocomic. I haven’t gone through their library extensively so I’m not sure how much of what you’re looking for they’ll have