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?
I have a lanyard with a carabiner hooked up to my keys and tie it into a belt loop on my pants whenever available. So for most locks I don’t even need to unhook the carabiner. I find that carrying things on my body is the best way to prevent misplacing them. Which, on a side note, is why I hate to carry things like pocket umbrellas. Despite the name, they don’t fit into my pockets and therefore get put down anywhere when I need my hands free…aaand they’re gone. But I have a snazzy messenger bag that has all my kit for everyday use in it, including a small umbrella.