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?
Ugh I caught myself staring at a wall whilst my brain ran away while trying to think of something. Carabiners for keys, you can clip them onto your purse, backpack, belt loops, etc. To keep from setting them down in random places or dropping them and then telling yourself youll totally swing back around to pick them up in just a second beforenyou forget you even dropped them and where.
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.