I think the common strategy is for buying bitcoin is the DCA approach which most of the whales also used in acquiring bitcoin. Michael J. Saylor also use that DCA approach which I have noticed it whenever he purchased bitcoin. He has not observed the bull time to avoid buying but he bought when the price is high as well. But what he does is whenever the price hit All Time High and it reduces again little bit he would buy it if he has the cash.
Last year when the price hit $117k and reduced to $90k he bought it. So the common strategy for bitcoin investment is DCA. You can set different time frame to buy.