Just alter your rep scheme, set up the baseline of what weight you are able to lift within just that range, then development on it till You can not development any longer. The challenge of weight loss plateaus can be very disheartening. There might be some physiological explanations for this. https://econopass.com/health-and-fitness/fitness-zone/fitness-mindset-power/7-proven-strategies-to-overcome-workout-plateaus/