IMHO, you can participate in all airdrops, because you risk nothing.
And no one will give you a 100% guarantee that the coin you missed today will not make x10 tomorrow
That's wrong. I mean, real airdrops that just give you some coins - sure, you can only win nothing or gain something. Yet there are such 'airdrops' that ask you to send them some coins in advance which they will return later or something. Obviously, they don't, so you just lose your money. Others ask you to provide private keys and for some reason people really do that. So, OP, just participate in airdrops that don't require any of your own investments, passwords or private keys and it's gonna be alright.