Splinterlands uses Hive-Engine, they have a NFT smart contract already and a pack manager you could use. I don't use them for my own personal reasons but it would provide you with what you want.

NFT's and block chain connections is a very deep rabbit hole. With many different opinions of what is good and bad.

Outside of On-line I have been in the board game industry for just over 20 years. To get more play testers for your table top, try and use some of the virtual table top software and see if you can get more players to try it out.

Just suggestions off the top of my head.