First few of those it found had a lot of links, sure!, but no commentary around them to explain why they are awesome which is the other half of the discovery problem, no? If I have to click 50 links to find out what they are - and they generally link to the RSS, mind, without a link to the website which means that clicking will only give me a "Do you want to open this in ReadKit?" prompt - I've got better things to do with my time, really.
That's a fair criticism. I'd very lightly push back that sifting through some random links might very well be worth your time if you spend a large amount of time in an RSS reader. I also think it's table stakes for a good feed reader to make it easy to add/remove feeds, for the sake of sampling new ones.
There's probably a better way to discover than sifting through large lists with zero commentary, but if you're starting from literal zero, a big list isn't an awful place to start.
It'd be interesting to seed some pagerank-like crawler with blogs you enjoy, so you could use its outputs as your "try this out" list. I've experimented with building something like it in the past, it's an entertaining task for sure.
Some bloggers also have handy pages designed to give you a high-strength outbound signal, e.g. https://jvns.ca/blogroll/. It's worth seeking those out, where they exist.
I used Feedly every day. I don't actually use it to discover RSS feeds, though; more often I see some site and put it into their Add function, and it finds the feeds in it.
Some stories are still behind paywalls (e.g. The Local in Munich), but you can at least read the headlines.
"awesome rss feeds site:github.com"
But you can start with any publications you already subscribe to (newspapers, magazines, etc).
See if any people you respect write blogs, follow those links and see if those people write blogs, etc.