Ignore the website part. When someone asks to buy your art, just send them a message. Communicate, send them your bank account or Paypal. When you receive the payment, ship the item.
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If I were you, I'd create Reddit/IG/FB/Tiktok account.
On Reddit: Find a subreddit that you think people interested in your art. Post your arts there.
On Tiktok: make videos of your art with trending music.
On IG: Post your arts frequently. Post reels with your Tiktok content. Follow for follow strategy still works.
On FB: Find groups you think people interested in your arts, and post.
If your arts are not violated any copyright policy. Create an Etsy account. Post your listing there, and redirect everyone to this.
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This is a real business, you have to spend time and effort to make it work.
Not only marketing part, but product part too. You have to research what the market want, and draw following what they want to see (Not what you want to draw)
Don't expect overnight success.