You can try setting up a going to bed routine that helps with winding down. Things like writing in your diary or BuJo for 3-5 minutes, breathing exercise (a minute or two), or meditation, brushing & flossing teeth, etc. And not starting anything new in the hour or so before bedtime that can get you hyper-focusing.
Basically something light that you can look forward to and eases the transition from brain on to brain off. Your brain is not going to switch off instantly so give it something to do!
And if you forget to follow your routine, you can try again the next day instead of beating yourself over it.
Asking someone else to remind you won’t work because then you’ll wait until that person reminds you and if they don’t, you will feel like blaming them even though you know it’s your responsibility.
It may take a while to come up with a routine that works so you may have to experiment a bit.
This is more or less what I try. I still don’t always follow it but when I don’t I miss it now.