Same thing happen for me also. before i invest in crypto i also joined 100 of airdops. but recieved nothing. but few months later i got 6 airdrop tokens. none of them are not even listed in any exchange yet.
but we should not forget that these were given to us free. plus what happen if one of these token will have gone to moon after few years. so i let them to stay in the wallet till the right time comes.
so i will never stop joining airdrops.
try and try, one day you can sell.....