just dont buy the coins which have small trading volumes. it's too dangerous. if you can't sell your coins to anyone, then you can just stay with these coins forever
I will never buy those coins/tokens because I know it useless and its hard to take profit on no volume listed coins. Well, technically there's a volume but that's not enough for you to trade actively.
Good exchanges will de-list all the inactive tokens/coins because they are not making money with them so that's the best solution for the exchanges. Buying no volume coins or no demand at all is like losing all your money into shit things, always but the best and top coins to make profit.