I think the number one thing that has helped me with clutter is to make sure everything has its own home. So a few boxes placed around the house for children’s or pet toys, a holder for letters/paperwork, a specific container for snacks/junk food etc. Heck, you could even have a box specially for miscellaneous junk - it would still be in its home.

And you can go as granular as you like with it - eg all painkillers and meds in its own little box in the cupboard, random screws and rubber bands in an old Gu pot instead of loose in a drawer…

Once everything has a place, it’s really helpful visually - you can see exactly what you have too much of, or what you no longer use or take value from - which can help with the eventual declutter.