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Go for a walk before bedtime, try taking a bath or a hot shower right before going to bed. Also this technique is pretty good: https://www.healthline.com/health/healthy-sleep/fall-asleep-fast#10-secs-to-sleep
One more thing I often do when my thoughts are occupied before sleeping is I keep repeating "Don't think. Don't think. Don't think." - that occupies your brain and you stop thinking.
One more thing I used quite successfully at some point is the "describe the path method". You start imagining yourself walking a path you really know well, like from your house to your work or to the store, then you start describing everything you do and see in your mind - "I open the door, I turn left, I see a tree, I go past the tree".
And the last thing is meditation while laying. Usually people meditate sitting, but if you want to fall asleep - you need to do it while laying down. Just close your eyes and imagine a candle light. Look at it and think about it. When you feel that you think about something else, just tell yourself "ok, I was thinking about [this thing]" and return to imagining the candlelight. You can replace the candlelight with a shiny metal ball for example.
Sleep well, it's really important! :)