I'm curious have you ever tried working out in the early hours after waking up? This alone determines if I'm getting good sleep or not. I'll end up staying up way later into the night unless I worked out that morning.
Throughout college my routine was to go to the gym every weekday at 6 AM before class. In my case, my insomnia is diagnosed as insomnia in the absence of other external factors. Lifestyle choices like proper light exposure, getting consistent exercise, melatonin, not drinking caffeine, not using electronics before bed, etc. don't affect my quality of sleep.
As a teenager who would play games often into the early morning hours (I remember I'd just be going to bed as my father went off to work) feeling like complete garbage and just mentally slower for a few days because of it. I couldn't imagine this all the time...
Waking up early and doing a workout for an hour or two helps me to sleep very well for next 3-4 hours after the workout -- or keeps me sleepy for half the day. Works totally differently in the evening. Brain just goes at double speed after an evening workout.
People with chronic insomnia have generally tried everything and it’s unhelpful and annoying to offer your suggestions, I realize you’re trying to help but yeah.
Also pretty obnoxious to jump in as a third party and sass someone for trying to be helpful to someone else. Puer can speak for himself if this is bothering him, and since he's posting about it on a public forum, I actually doubt that it does.