Tools.

Keys always stay/go same place no matter what.
Dates on calendar annual repeat.
Simplify, always do annual doctor appointments same time each year.
Associate things. Need to remember to take something somewhere? Put in on your shoes so you can't put them on without it being there.
Medication in the way of toothbrush.
Routines, no first glass of water in the morn without meds. Then get breakfast.