One source of stress can be that we loose track of all the things we need to do. This feeling that you forgot to do something important. I found that keeping a bullet journal helps a lot with keeping track of all my tasks and deadlines. It also helps me to eliminate tasks that are not important (see also my earlier post on The importance vs urgency matrix).
If you search on the internet for ‘bullet journal’ you will find people spending endless amounts of time drawing and painting in their bullet journals. If this gives you joy, then certainly go for it. However, the essence of a bullet journal is much simpler and very well summarised here: https://www.youtube.com/watch?v=fm15cmYU0IM
You can also use it to keep track of new habits that you want to introduce to improve your mental health.