Hi
I am too forgetting to do some things - because in fact I am not much willing (for any reason) to do it.
In such a situation I try first to make clear to myself whether I am really willing to do it or will accept the fact, I am not going to do something (regardless it lived in category "it would be good").
If the task survives this trial, then I do something to make it really happen - like setting up some reminder on my phone, placing label or something physical to the place, where I will be located at the moment the action is required, or "hang the reminder on some trigger", like "when I will touch that black door handle leaving my home, I will remember xxyy.