Tips on getting better sleep?

I’m 31F, single, no kids. I used to sleep really well I would go to bed around 11 PM and sleep my usual 8 to 9 hours. But for the last year, I’ve not been getting quality sleep even though I’ve been sleeping around 7-8hrs hours. The problem is I can’t seem to just go to bed like my mind doesn’t want to sleep, but my body does. My mind wants to watch TV or be on my phone or read. I’ve tried melatonin and I don’t like it because it makes me feel super groggy the next day. And now I’m noticing it’s harder for me to lose weight even on a calorie deficit because I think my cortisol is high. What helps you and what’s your routine like?