Bull Market regrets typically boil down to 2 flavours.

1) Not betting enough:

- Solution: Ramp up your bets with more exposure, dive into less liquid investments, and hold steady during wild price swings and high valuations.

- Downside: This leads to increased portfolio volatility, increased risk of total loss, and a probable drop from your portfolio's all-time high.

- Outcome: Potentially higher returns but with less security.

2) Not keeping enough:

- Solution: Take profits as the market rises, get more cautious over time by reducing exposure, and manage trades more tightly.

- Downside: You might miss out on further gains and possibly squander opportunities.

- Outcome: You'll likely make less money overall, but you'll retain more of what you make.

However, you are unlikely to fix both at the same time.

Damned if you do, damned if you don't.