Suppose you have some bitcoins (let's say 22) and you bought them / got them a few years ago very cheap, and now you see it's price and.... what to do?!! Will you take the profit and go away, or sit and hold further? Suppose you're not going to buy more. But when to sell?
Loose some, but definitely hold the majority since bitcoin prices are still pumping up and it won't even go down $15,000. So play it safe and dump some and diversify your money. Place it on eths or even buy some stocks at your exchanges. You can even use the bitcoins to invest on ICOs.