TTRSS only gave me trouble. Threw all kinds of strange errors at unexpected times. I don't know how many times it died on me after an upgrade. I eventually gave up and found FreshRSS. Been running (and updating) it over a year, without a single problem.
One of the best things about it is escaping the algorithmically curated feeds.
Every and service that I use has an RSS feed, except for Twitter. I use https://twitrss.me/ to follow users. If you don't find a feed, sometimes you just have to dig a little. You learn at which URIs the most commons CMSes presents their Atom/RSS feeds (hello /feed/).