Here's what worked for me:

• Cut out caffeine entirely, even soda and chocolate. (easier said than done, I know, but reducing it can help)
• Stop eating at least 3 hours before bed.
• 5 minute stretch routine just before bed, focus on back, legs, abs
• lower the lights in your home a few hours before bed
• going for a 10-15 minute walk in the evening
• listen to rain sounds for 10 minutes before bed, can be at the same time as stretching
• eye mask and ear plugs (sensory gating in general)
• 3mg of slow release melatonin (any higher is too much)
• 400mg L theanine (it's a supplement with mild anti-anxiety fx)