I still use RSS for 100% of my content: A couple news sources, a bunch of YouTube channels, a couple webcomics. It's easy for me, though, because I don't use social media, which I imagine wouldn't really be well served by RSS.
I don’t use Bluesky, but there are a few people on there I wish to see updates from (including one webcomic artist without a website) and I use Bluesky’s integrated RSS to do so. Same for Mastodon.