What's wrong with twitter?
I use miyoushe, twitter, pixiv, 4chan and gelbooru for my HI3 artworks. If you want to stay up to date with your favourite artists, twitter and probably lofter are the best places to look for artworks. Pixiv is rarely updated these years and other sites mostly just repost from twitter anyway, the biggest problem is that not everything gets reposted.
Some artists tried to migrate to bluesky some time ago, but it was a much worse platform if I remember correctly and they just came back to twitter anyway.
I would use lofter too, but it was a pain to register the last time I tried.