The worst thing for insomnia I found as well is worrying about insomnia. You can literally lie awake worrying about lying awake.
I never found the "get up and do something else" approach worked. That is just guaranteed to make me feel even more knackered and awful the next day. At least in bed I am resting even if not asleep. I don't subscribe to the notion either that bed must be for sleep and nothing else.
I also find phones helpful and not a hindrance to sleep, unless you can't stop yourself from doom scrolling. My blue screen filter goes on at 9.30pm and I always go to sleep listening to an audiobook or podcast- not too thrilling or scary, obviously, as that then has the opposite effect. You can set a timer so it goes off after an hour - DH goes to bed later so it doesn't disturb him anyway.
When I go for a wee in the night, I have night lights but don't put the lights on, so often I don't even fully wake up (we have an ensuite so I'm not going to fall down the stairs).
The best thing is having a bedtime routine and to try to go to bed at a similar time most nights. I don't get up at the same time every day but five days out of seven now I can wake up naturally without an alarm which helps too. I go upstairs, put my PJs on, have a natter to DDs for a bit ( they often go to bed about the same time, being in their late teens now) fuss the cats.
Then once that door is closed I say to myself that from now until I get up is my time and I don't have to do anything for anyone else or think about work, or my mum's health, or what anyone else is doing, for a good 8/9 hours. Some of that time I might sleep, or I might read a book, or play a game, or listen to a podcast, but it's all for me. Often I naturally find myself taking a deep breath and sighing with pleasure at the very idea, and I find it gives me great piece of mind.
If thoughts do come or I think of something I must do the next day, I set a reminder on my phone and then it's out of my head. But mostly I find I don't worry about things now because I've created this space for myself where I don't have to worry about anything.