Genuinely need to know what to do if you can't fall asleep because nothing I try works

I've spent the last few weeks trying to figure out what to do if you can't fall asleep because none of the usual advice is working for me anymore. I keep the room cold and dark, I've cut out caffeine after noon, I even tried melatonin and it barely touches it. Most nights I'm still wide awake at 2am with my mind racing about nothing, then I'm useless the entire next day at work. I'm starting to feel like I've tried literally everything people suggest and I'm just stuck like this. Has anyone actually broken out of this cycle or is insomnia just something you have to live with forever?