It’s difficult, so firstly you have to accept that good enough is good enough.
You need a routine to get essentials done everyday, and they must get done every day. Ie dishwasher loaded and unloaded, washing machine load and put for drying, food not left out, rubbish not left out but put in bin.
Im talking essentials, making the bed isn’t essential (and in fact an unmade bed airs better).
Then everyone in the house, but mostly you and DH, PUT AWAY, DONT PUT DOWN. so if scissors get used, they get put away, not just left where they were used. Also, ONLY DO THE JOB ONCE NOT TWICE. Ie hang your coat on its hook, not the back of the chair, because it will only have to be moved to the hook some time later.
Have a place for everything. Hard I know when you have too much stuff. But look at the areas that cause you most agro. So if shoes get left in the porch, instead of going back to their rooms, put a big shoe basket by front door. Put up a hook for school bags etc.
If paper work piles up, put three (or more) trays out for urgent, bills, file. Open post everyday, even if you don’t action it.
I remember having too much stuff all the time and feeling that my house wasn’t big enough. Now that my (only) child has left home, my house is now big enough. Funny that. So just remember, because you feel you live in chaos now, this doesn’t mean this is who you are and you won’t end up in old age never ever having a tidy house.
Re your 7 year old. I personally think 7 is quite young to be responsible for her room. Often what feels like refusal is that they just don’t have the skills yet to think and organise ‘tidy your room’. So ‘put your books on the shelf’ may be an easier instruction to follow. I found offering to help my child to do a specific task in sorting her room, meant that once she got started, I could quietly disappear after 10 minutes. You may have struck lucky with a helpful 10 year old who has set a high standard of behaviour for your younger one to follow.
But let your DH take over this. It’s causing you too much stress. He may have a different tactic that works. Obviously don’t do this if he’s likely to shout more than you.
Best of luck. But good enough is good enough when you are deep in the trenches of parenting.