It's a lot easier than people think, in my opinion.

Light is the main thing that sets your circadian rhythms. If you want to sleep at 10 PM, turn off the lights around that time. Fully dark. No phone. Maybe even blackout curtains. Better if it's every single night, including weekends.

Listen to music or a podcast if you're bored laying in the dark. But no light after the time you want to sleep.

You won't fall asleep at 10 the first night. Or the second night. But it'll slowly get earlier and earlier every night.

I've done this many times. When I worked early mornings, I easily adjusted to falling asleep at 8PM by shutting off all lights consistently every night around 7:45.