Depends what your into. Hackernews is always a good feed to add, ars technica, your local news station, your local news paper, I got an rss-bridge running that posts to my feed when apps update with their change log, when a project on github has a news release, when one of my favorite artists releases music on apple music. Institute for the Study of War is also a decent unique feed if you want to read up on strictly tactical updates on ongoing conflicts.
Honestly, thats the beauty of RSS feeds. They are everywhere, I got feeds aggregating memes, and webcomics. You can run a bridge that prowls instagram using your account and generate a post in your feed when your friend posts something. Literally RSS is all about turning the internet you use into your own personal feed without the BS algorithms crammed down your throat. Someone creates a post, and your feed gets sorted by time posted. Easy as that.
I use Lemmy really for the social interaction. Something which RSS doesn't have.
Yeah, they got cloudflare running on their domain so even a bridge won’t help for that specific site. Depending on what you are using it for you can find alternatives with more RSS friendly sites. RSS-Bridge can track music releases through apple music even if you don’t use apple music. I am pretty sure you can find alternative sites for other types of media releases.
I find this the best place to find RSS feeds that just work with out bridges:
RSS List