hello, welcome!

This is a struggle for me too. In fact that was exactly how I fell last time 3 weeks ago, couldn't fall asleep. I have not tried it but people here have recommended mindfulness exercises. What I usually do is listen to very relaxing music/soundscapes, like delta wave sleep tracks. If I'm really awake I have a few videos that I find very relaxing, which help me nod off.

Serious exercise followed by a geshmake shower usually helps. Welcome and hatzlocha.

try listening to a shiur - and NOT gemara halacha etc if your just going to tune it out , something  that you find interesting by a good speaker .
try torahanytime or gye .

I hope you will succeed.