Hey if you know when to buy and when to sell, you are a genius! As simple as it can be when you're not holding crypto, it's so hard when you have it because there's so much faith and emotional attachment to it. For me, it's even pride involved. Airdrops also make me want to hold on to several coins to be eligible. If I sell the original tokens that are counted by snapshots, I'll lose the airdrop potential. It's usually best to just hold long and let the benefits accrue over time versus taking the fiat gains if you don't need the money at the time, but also take some profit at times to make sure you've got padding in the real world for now.