Until I was thirty, I used the exact same to-do list format which basically consisted of listing everything I wanted to accomplish in every area of my life and in no particular order. This list worked, to a point, until it was eventually lost or until each point on it was no longer legible. However, this was extremely inefficient.
It took working with coaches, reading books, and talking to others in order to collect enough information for the second generation of my to-do list format which I use now. This format works on both a white board with post-it notes or with an app like Trello. The disadvantage of using a white board is that it is not always with you wherever you go (some might see this as an advantage though) and the main advantage is that you are able to more easily notice how much you are accomplishing if you are more kinesthetic.
The basic changes which have boosted my productivity are separating the different areas of my life and business, tracking what I have done, focusing on the most important points for each day, and making sure points have actionable steps included. This might sound like a lot of extra work but it has actually proven to save me a LOT of time and energy when working on multiple projects and businesses simultaneously.
At the moment, because of how mobile my work has needed to be lately, I am only using Trello (but I am definitely going to use a whiteboard again at some point). I have one Trello board which is divided into four lists for the three main areas of my business and one for my private life. Additionally, I have a list of points where I am waiting on someone/something else, a list for what I want to accomplish today, for what I am working on at this very moment, and a list for what I have accomplished this week.
One big surprise in using this format has been how important the finished column is for my motivation. It is so great to see everything that has been done instead of just crossing it out and forgetting about it or swiping left in my old Clear app. At the end of each week, I can clear the whole thing and see how far I have come, and I can also incentivize myself for accomplishing a certain amount of points with chocolate. Another relief has been putting more points which are time-sensitive directly onto my calendar instead of adding them to my to-do list.
There are so many different ways to keep up with what you want to get done. I think the most important thing to do is just use some sort of system so that you can get everything out of your head and be more focused by day and sleep better at night.