...One thing these airdrops taught me is never sell all airdrop, keep some and stake if lp/governance is available. There were few which rewarded for holding/staking UNI token, and optimism's second airdrop was also for delegating op tokens. This is pretty much passive way of earning and you didn't use anything from your own pocket.
This does not apply to all coins. For example, both Arbitrum and Optimism were profitable to sell immediately after the airdrop was distributed, and as the graph shows, those who did so had a good opportunity to buy these coins after the price dropped. But the coins from Uniswap and Celestia needed to be held tightly in order to multiply profit.
Well, you can sell but you should hold the part of it. For optimism, there was second airdrop for delegators, if you sold all your airdrop, you wouldn't have made it, meanwhile if you held part of it (let's say 25%), delegated it you would have made it. For rest 75% you could as you please.
If it's good project, it'll last long and later you can dump anyway, like $OP right now is $3.7.