I used to do Air drop and bounty. Get all coins in time when the market is down. The value of all these coins lost 90% even now looking at it I do not believe it is no longer valid.
I cannot sell them because no one buys them, and its value can only be enough to transfer to exchange.
So do you have a way to hide it or delete all the coins from your wallet?
No, you cannot delete or hide those tokens from your wallet. But if you don't want to see those tokens in your wallet in any way, you can transfer the tokens to another address. This is the only solution.