I can only say what's been working for me recently having got 2 ND boys the same age as yours separate rooms. I know mine are very into their games and logic puzzles etc I know if I had a child that could talk the talk at bedtime I wouldn't know how to handle!
7pm substantial snack so they can't tell me they're hungry in their beds! (yoghurt, drink, fruit, biscuits) and watch an episode of something
7:30pm toilet and brush teeth
7:30-8pm quiet activity in their beds (e.g iq puzzles or tablets on a bad day)
8pm 8yo likes to listen to a bedtime story (e.g..Honeybee library ones on Spotify are kind of meditative, the kids like them anyway) 5yo likes to listen to Today Today podcast on Tonie box.
8pm-8:30pm lights out. 5yo likes a bowl of ice to suck at this point for some reason.
Sometimes 5yo is still awake at 9.
I try to have as little interaction as possible with them these days and prioritise getting them physically in their beds.
I don't read to them anymore as it just causes them to get over excited, show off, jostle for my attention, mess around, jump on the bed etc. I've let go of the idea of us all having a wholesome time cuddling up for story time...it's not happening. I get them physically in their beds with an incentive of getting some time doing something they enjoy. 8yo likes IQ puzzles, rubix cubes or a simple task with his hands...anything you feel they will like but not over excite. 5yo at the moment has a magnet puzzle thing. The other day he was so hyper I just made him count slowly to 10, then take a deep breath, and then count slowly to 20 and by 14 he was yawning!
If it's a bad day, there's lurgy or things are running late I get them on their tablets (not videos only games) as their quiet activity (again I'm sure I'll get ganked for this). I make it super clear before they get them that it's on the condition that they turn it off nicely when I ask and they get xx amount of time eg 15 mins or something. When it's up I give them a reasonable min or so to finish what they're doing and lots of praise for turning it off. Pretty much they're very good about this but sometimes might want some other activity for another 10 mins or so. I then ask them what they want to listen to on their audio stories and generally keep things firm and boring but still loving of course just not indulging in them or giving them the opportunity to play the 'lets mess around with mummy game'.