Years ago - many years ago - when I was in my 30s, I discovered a foolproof method of prodding short term memory into action. It was very good for items such as not forgetting to stop at the store on the way home, or to keep an appointment, or other needs that had to be met within a few hours.
The trick was to move my watch from my left wrist to the right one. Since I looked at the watch quite frequently, I'd recall that I'd moved it to the other arm so that I'd not forget to stop at the store, etc. Worked every time.
Now, nearly 60 years later, I still remember to move the watch when I want to recall something later in the day, but it doesn't always work these days. I'll see that the watch has been moved, and I will know that I'm supposed to remember something. That part works. But I often forget what it is that I'm supposed to remember.