Hard to sell to be honest. NFT is descriptive enough and those are non fungible tokens, cryptocoins are usually fungible.
Just put it for sale and accept offers if any.
NFT coins (and tokens) are the crypto coins associated with particular NFT projects. There are overviews with coins that are related to plenty of major NFT projects. The fact that these sites have created a separate section for it is a decisive factor for me. But, the plural variant (nftcoins.tld) is better suited. Still, I think you have a good domain, and I recommend hodling it.