I, quite rightly, get mocked slightly whenever I unironically use the phrase, 'I'll add it to my list'. The truth of the matter is, that I am most likely literally grabbing a pen or pencil and adding whatever you've asked me to do/check/buy/sort to my daily list.
When term-time is in full swing I normally have a daily list – at the moment I'm using ToDoist, but I'm very fickle and change apps, if I use them, often – that I break all my tasks for the day down into tiny, manageable, cross-offable ones.
It looks stupid and counter-productive when I have things like 'empty bin' or 'read this one-page article' on my list, but on bad days having 'shower' and 'make bed' on my list and being able to start the day with the sense of at least getting two things done is helpful, and reassuring.
I had a teacher at school who, when talking about my tendency to listify (which definitely isn't a word, but should be) she told me how, when her mother died, the only thing that kept her literally moving around and doing things was making lists every day. Lists for absolutely anything and everything, so that she could see small things that were still manageable and build them up into a day, then days, then weeks.
They're certainly not for everyone, and I am not stringent enough to use them every day, but crossing things off lists, however small, can help organise and get through your day.