Well I didn't mean to just endorse Bluesky but call it out as one of many alternatives.
I'm actually active on Mastodon but I am thinking about getting on Instagram as well because the content I post that does the best on Mastodon would fit in there.
it won't surprise you to learn that i like mastodon but haven't used it in months
Do you know about Pixelfed?
(admittedly you could make the same criticism of hn; it certainly isn't decentralized and resilient against administrative censorship like usenet was)