Sleep Optimization Tips

I have a question about this episode Understanding and Using Dreams to Learn and to Forget | Huberman Lab Podcast #5 and this Sleep Insights. I have implemented nearly all the sleep suggestions that Dr. Huberman gives, such as getting sunlight in the morning and late afternoon, dimming lights and avoiding screens at night, eating 3 hours before sleep, keeping naps or NSDR short and early in the afternoon, stopping caffeine intake after noon, exercising consistently around noon, and staying hydrated during the day. However, nothing seems to work because I fall asleep fine around 9 or 10 pm but keep waking up after 4 or 5 hours and can't fall back asleep, even with yoga nidra or NSDR. I went to the doctor, and they prescribed me trazodone, but I still don't get more than 6 hours of sleep. What should I do?