I’ve some way to go, but, like other posters I do the following:
Never leave a room empty handed.
Don’t tidy up ‘for’ the kids unless they’re babies. But I do remove their stuff from living areas and throw it into their room as I pass. One room is an utter dump, the other isn’t bad, simply because she leaves less stuff about.
Be ruthless about whether or not you actually need said item. Don’t keep it unless it is useful or beautiful.
Don’t buy it in the first place unless you have considered where it can be kept in your home
Have a system for end of life things. A box for worn out clothes, which periodically goes to charity.
Small items of child related tat - have a decorative lidded box in the living room where these items can be thrown
Shoes - have a system for discarded shoes - get a box or shoe bench in the hall if you have space.
Accessibility - some cupboards really do need a periodic organise and culling. Because otherwise no one gets anything out or puts it away because it’s too much effort. Make sure the tools for cleaning and diy are accessible, otherwise that doesn’t get done either, there will be loads of minor diy fixes that just need a screwdriver, but it is in the depths of the disaster cupboard and won’t get done.
Time- do two things at once. Whilst the kettle is boiling, you can unload a dishwasher and put everything away. Whilst your bath is filling, you can check your medicine cupboard for leaky/out of date products and bin them.
Re-gifting. I have a box for these, with a post it note telling me who gave it to me. Then I can safely donate it to the PTA raffle or whatever without offending the person who gave it to me.
Try not to keep things ‘for best’ - this means no one benefits much from the posh china, and there are now two sets of crockery to consider.
If you are a long way from this, pick a room - say the living room, and work on that one. Work your way around the house from there. Be realistic, set yourself deadlines and maybe a budget for shelving, boxes, basic diy tools. Take as long as you need, but make progress.
Good Luck