Have an evening sleep ritual something to signal to your brain it's time to start winding down.
Avoid devices and screens after a certain hour.
Don't eat too late.
Avoid caffeine late in the day.
Avoid alcohol at bedtime as it may help you fall asleep but cause to wake a few hours later and getting back to sleep wil be more difficult than if you had none. Also will cause rebound anxiety.
Read something boring and comforting at bedtime - fiction is good for this.
Focus on breathing inhale for 7 hold for 5 exhale for eight - repeat.
You are not your thoughts.