My recommendation is a small thing: a trashcan with a swinging lid!
Covers the trash, reduces smells, will prevent trash tetris (sometimes), and very good instead of foot-pedal opening trash cans or trash cans put in a cupboard.
Another thing are toothbrush holders that stick to mirrors. Might jog that memory of needing to brush your teeth!
Wall-mounted keyholder by your door, too. Anything I put on a flat surface will eventually be lost or covered with more junk & papers. My keys are WALL-ONLY!!!
What item(s) have helped you with your struggles?
A more subtle one. Get a bunch of bag clips (I used IKEA ones) then write the name of all the things you keep in the freezer (peas, sweetcorn, chips etc). You want 2 of each. Attach 1 to each bag in the freezer, open or closed. You also want a piece of string attached somewhere. When a bag is empty, put its clip on the string. Congratulations, you now have a shopping list. Once you restock, just attach the clips to the appropriate bags, before putting them away.
At least for my household, this seems to flow well. There are no hard steps, and an obvious flow to it. Unfortunately, I’ve yet to figure out how to extend it to canned food, but it works for any bagged foods (pasta etc)