Except for a small window around the peak in December 2017, if anyone bought bitcoin anytime during its existence, they would be profitable now.
Most people bought during the peak, that's why it was a peak.
As any other pyramidal Scheme the only way to win is to be there first. Later on you are just trying to put other people into the scheme to regain some losses.
There is no cure for jumping in with your emotions and money into markets.
How is it any different from buying stocks at its peak? If you bought SPY during 2008 peak bubble, you had to wait for 6-7 years to even break even!