What signs indicate modifying your fasting window for afternoon training?

[Larry.M]

I've been following an 18:6 intermittent fasting protocol for three months now, mainly to improve my insulin sensitivity and manage my energy levels, but I've hit a plateau where I'm not seeing any further benefits and my workouts in a fasted state have started to feel noticeably weaker. I'm careful to stay hydrated and I break my fast with a balanced meal, but I'm wondering if the timing of my eating window is suboptimal for my training schedule, which typically falls in the late afternoon right before I break my fast. For athletes or active individuals who use intermittent fasting, how do you align your training with your fasting cycle to maintain performance? Have you found it necessary to incorporate targeted supplements or adjust your macronutrient distribution on training days, and what signs indicated to you that you needed to modify your fasting schedule or take a break?