in less than a week it's messy again
You can not seriously expect to run a house and for it to stay tidy for days.
The trick is to do something every day. If you leave it for two days, it will start backing up.
Basics include:
making your bed every morning as soon as you’re up.
A quick squirt and wipe in the bathroom daily, literally a two minute job.
Empty bins.
Sweep any hard floors.
Wash up and wipe worktops.
These are the minimum you must do daily if you want to keep at least ‘top tidy’
I’d suggest you invest in a decent hand held vacuum so you can clear up any crumbs etc easily from carpeted floors.
Allocate jobs. Even the youngest member of the household can learn to pick up toys, pull their duvet straight and put shoes and coats in the correct place.
Give yourself easily achievable goals. For instance promise yourself you’ll do 15 minutes in the kitchen. That’s long enough to clear the breakfast dishes, wipe the surfaces and sweep the floor. Then you’ll have a coffee, two biscuits and watch an hour of Ruth and Eamonn.
Then a few hours later, promise yourself you’ll do 30 minutes of ironing and not a moment more, then you’ll reward yourself with some other small treat.
Make dinner 6 nights out of 7 and if you can have dinner at your parents or have a take away on the 7th night, then have 3 of those 6 dinners be simple one pot meals or beans on toast type meals. Wash up as soon as you finish eating. If you sit down, you’ll not want to get up again.
Have a place for everything. Have a clear out and throw away any broken toys, outgrown clothes, unwanted gifts etc. That Baylis and Harding gift set from Christmas 2019 that’s cluttering up you airing cupboard can go.
When you store bedding, put the bottom sheet, 3 pillow cases and duvet cover into one pillow case. Makes changing bedding quicker and easier.
Store towels by rolling and stacking, easier to pull out a rolled towel if you’re after a particular one rather than you keep using the same top ones from the pile iykwim.
There are loads of helpful tutorials on YouTube about keeping tidy. Or alternatively, watch an episode of How Clean is Your House, that’s a terrific incentive to clean house.