Agreed. Take profit or sell most of it depending on how much BTC we have. For me it's simple, if it's not possible to sell some, I'll sell all then wait for the right time to buy back.
what if that right time don't come again? i think it is always better to keep a portion of your bitcoins for future. because eventually bitcoin's price will keep growing.
So I will repeat it from the beginning, buy at the price available at that time, and sell later after reaching the next new ATH. Simple.
In addition, I already got profit from the Bitcoin that I held before.