If you want to book profit at all time high then you should put a sell limit. It's gonna be volatile there. When it hits all time high, the price will come down from$20k, $19.5k to $17k, $17.5k within 24 hours.
That's exactly what I have said. So if we look up at the chart, about 3, 4 days back, when it hit $18969 it came back down to $17600 and finds support there
So $17500 is going to be a support zone. By the way zones are not precise points. That's exactly like I have said.
And I feel comfortable buying it for $20k because I am playing the long game. I am expecting the price of Bitcoin in 2022 at between $150k to $250k, that is a 10x.
Also if the price retraces to $15k after hitting the all time high, I don't mind the discount. That's 15x instead of 10x. But you can also book 50% profit when it hits $100k. So this is my plan.