You are living in a fantasy if you think that afterwards you can figure out that you should have had sold at $108k and bought back at $74k.. Sure, guys who had bought bitcoin earlier, have more options, and sure guys who bought earlier might not be concerned so much about accumulating more bitcoin.
Guys who think like they are going to be trading all of the various waves (or think that they can figure out when and where the waves are going to be) don't tend to have a lot of bitcoin, even if they had gotten into bitcoin in 2015, they were too busy fucking around trying to figure out when to buy BTC and when to sell BTC rather than focusing on ongoing, persistent, consistent, regular and perhaps even aggressive buying of BTC.
Additionally, guys do not realise that it's more difficult trying to figure out when to buy at a good price and sell at the top just to re-buy than just buying consistently. If one spend time looking for the best entry point it's more of a waste of time however the same time could be used to accumulate more.
I the cost of looking for a good entry price one is likely to even miss the opportunity to enter the market because bitcoin is volatile and predicting the way in which it will go is very much difficult hence the best opportunity or price to buy could be missed in the process of waiting for better entry price. when one can just buy at least if buying with some kind of amount like $100 could buy with $90 and use the $10 left for the dip, it's more understanding as one is buying already with the larger income while still waiting for the dips.
However buying first should be the taking into consideration rather than waiting.