Yeah, I could accumulate more bitcoin if have sold last the peak and buyback the dip at $3k. in 2017 I didn't sell at the ath, but thought it may recover or stay above $10k, well it didn't, so I missed the chance to get profits and more coins at the same time. If we can predict the bitcoin movement, at least 80% correct to buy and sell at the right time, even 60-70% is a big profit.