I am extremely skeptical of cryptocurrencies in general, so you may take all of my claims with a grain of salt, but coinmarketcap.com tracks something like 6800 different cryptocurrencies. I very much doubt all but a tiny, tiny fraction of them have any use case at all.
After more than ten years, I still don't see a use case for Bitcoin (perhaps El Salvador will surprise me, but I doubt it!). There is nothing I'm aware of that I need to do financially which I can do with Bitcoin (or the like) which I'm not better able to do with the regular banking system. (I don't have much need for contracts in my life, smart or otherwise, but I would vastly prefer to deal with a real lawyer and the actual legal system, expense included, than rely on a smart contract.)
It could be that that amazing use for cryptocurrencies is right around the corner, but after a decade I don't expect to ever see one. Certainly it's not NFTs!