Know your Niche first and don’t rush to sell your NFT because you need to create name first before someone buy your art. Selling an NFT is easy but finding a buyer is very hard, even if you make a lot of quality NFT and you failed to market that, no one will buy your NFT. There’s a lot of open market where you can sell your art, Opensea is the best option but you can also look for other market where it’s available in your country. Can you give example of your art? I’m curious for your theme of art.