For example ethereum is used for erc20 reasons, or bnb used for binance, or bch used by miners, basically there are tons of coins out there with people who use it. The reason why you should pick the ones that has a use is the simple fact that you are not going to have a lot of buyers for a coin that has no reason to buy, it has been like that in the past and maybe some coins from back in the day still go on (litecoin) without any use, but that is ending slowly.
BCH is used by miners and Litecoin has no use? That's the biggest absurdity I've heard of lately. Where did you get that idea?
For your information, LTC has almost twice the daily volume of BCH. That should give you at least some indication of the usefulness of Litecoin.