It's true instead of regretting what has done in past and how you miss the opportunity to make big profit, you should focus on upcoming opportunities as because there are alot new which can fulfill you regret, just like recently after losing opportunity to buy Bitcoin cheaper get opportunity to buy shib in early stage worth of 13k$ and get around 5billion$ profit, but the main factors you should face to get big profit will be Risk, because in early stage you will get opportunity to buy at cheap prices but risk of getting scam is huge, as mostly new project do scam and there is no guarantee to get profit after getting at cheaper price so mostly everyone regret after huge profit not in time of early opportunity....