One of the strategies that changed my sleep quality for the better is to stop taking coffee after 9 AM; after learning that caffeine has a half-life of around 6-7 hours[0], but a quarter-life of around 12 hours. If you have a cup of coffee at noon, a quarter of that caffeine can still be circulating around your brain at midnight.
[0] https://youtu.be/k5BMGmf1ai0