Why though?
Do you think that BTC will drop after this cycle and never climb up again?
For most long-term investors, not doing anything is the best move. So it all boils down to what one's goals are. If your goal is to make a profit this cycle and potentially buy back cheaper then yes, you need to figure out some solid sell/buy indicators, otherwise, you're risking making trades based on emotions.
Nope! Did I say that?
Making trades based on emotions, well TBH I don't dare to call myself a perfect trader or even you can say a good trader, but at least after a bit of experience I am able to speculate the market moves, at least on a macro-level so booking profit at near expected all-time high even its risky is worth it, the market will fall for sure to make a new bottom for the next cycle, and after booking good return i can spend some and make much better accumulations again, and I won't call it trade based on emotions as there's a proper strategy and mindset already, Whoever is gonna book 100% and get an exit is really a fool, booking 30% to 70% whatever suits a person is not bad at all.
Not recommended to any investor as there's risk involved that the market might not fall to a super low level, and you might spend money and at ATL of cycle, you won't be able to buy back.