You have to respect your risk mangement and need to fix your 1 ratio.

For example : 1R = 1 %

It’s mean that when you risk 0.5% and you got 5R, your real Reward is 2.5 %.

Same example for 1R = 0.5 %

It’s mean that when you risk 0.25% and you got 5R, your real Reward is 1.25 %.