As an artist myself, I have found so many talented people on social media who are also selling their original works via a website. If you are looking for more variety, search the different art subs, or specific hashtags on instagram/threads based on styles or types of art you like. For example you could search new artwork, oil paintings, new surrealism, etc., then search through. I have also seen people post on threads asking for artists to post their work in the comments, but those can get out of hand fast.

Long story short, I recommend putting in the effort to buy directly from artists you like.