Does anyone try to sell high, hold that money, then reinvest when the price is down? I'm entering my first bull market with a lot invested, thinking about trying to maximize it...thanks

A big Thank you to everyone who answered, I appreciate it. You all gave me lots to think about. ???? I'm definitely more cautious of the idea than before, and will probably just hold.

Edit 2. I am taking into account the taxes, and only considered selling a quarter of my Bitcoin when the price is double what I paid. I realize that people think this is a stupid question (from some of the replies), but I disagree. I want to learn, and was interested in what other people think/do.