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Have you tried the NFT showroom on Hive? Although I suppose someone would have contacted you if they would be interested in buying your drawings.

I do have an account in NFT showroom. But I only sold 1 NFT(It was also my first NFT).

Unfortunately this is how it is. You can't force people to like or buy art. Every artist has faced this and only a selected few make it. Most of them are just dreaming about becoming successful one day.