1:1 High win rate required

2:1 Win rate ≥ 40%

3:1 Win rate ≥ 30%

4:1 Win rate ≥ 20%

5:1 Basically a guaranteed profit

If the win rate cannot be sustained, rely on a high profit-loss ratio to make up for it; the higher the profit-loss ratio, the lower the requirement for the win rate.