My exact process for building edge:

1. Pull up all my trade screenshots
2. Stack winners vs losers side by side
3. Hunt for repeating setups
4. Lock in ONE pattern as a hard rule
5. Run 30 trades with that rule only
6. Check the winrate and P&L
7. Keep it or kill it

Then loop. No opinions, just data. This is how you actually improve instead of gambling on vibes.