>>58137170Pixiv is my personal choice for convenience and archiving (good size limit, can upload multiple images per post), but still has its flaws (only up to 10 tags per post, most tags are in Japanese).
Now if you want the best place to grow and spread your art, then unfortunately Twitter is the choice. Some artfags also use Instagram and even Tiktok, but the idea is the same: Go to the place with more people and start networking.
Honestly wish we had better alternatives, but dedicated art sites are never going to be as popular as they once were. Not when people just can get art in their Xitter feed, between whatever other forms of spergery they crave.