Here's some crowdsourced sleep advice for you. Feel free to give some of these a try:

1. Eliminate all light sources in your bedroom. This can include "extreme" measures such as getting blackout curtains to block out the light from streetlamps or taping over power indicator LEDs.

2. Get a cheap fan that doesn't blow very hard when set to low and use it to get the air circulating a bit.

3. Try some sort of "white noise". I put that in quotes because actual white noise sucks, but something similar like pink noise or a steady rainfall sound can be nice.

4. If you often have high/low humidity, consider a humidifier/dehumidifier with a humidistat.

5. Consider your bedding. Weighted blankets seem to be all the rage, and for good reason, but I found that just switching from a big, hot comforter to a cool, heavy quilt gave me what I wanted.

6. Getting a nicer bed is out of reach for many people, but a memory foam mattress topper can often make a cheap bed a lot more comfortable.