There is no legitimately good general art sharing platform which also encourages con/crit. ArtStation and the like are good for getting eyes on your portfolio, but awful if you want criticism.
PIXIV is good for building an audience depending on your """style""" but it's also not good for getting crits. Twitter/IG/other social media sites are similar in that you can gain an audience, but interaction is seriously limited.
It feels like since the slow death of DeviantART, there isn't any site which is truly feels the niche of being good for conversation about art, good for receiving criticism, and good for growing an audience all at the same time. The only thing similar still running would be probably FurAffinity but that's for a very specific subject.
Hell, there's hardly any art forums these days either where one can go to receive honest feedback. Though forums always had the drawback of being great for feedback, awful for building an audience.
I miss the 2003 - 2013 sweet spot before the rise of invasive social media, and before the collapse of sites like dA and forums.