Thank you!

To be honest, I picked Redbubble because of the cheaper shipping costs to Austria and probably also because of the website design (even if they're similar somehow). But I guess that both websites have the same qualities, maybe Etsy is more well-known, I really don't know.

Well, I collected too little experience for being able to give an advice. I think that the best way to sell things online, is, to be very active on every social media platform. Then you get attention and probably also some buyer. However, at the moment I'm not successful in it, maybe because I really don't have time and nerves to post a work of mine on every goddamn social media platform haha.