If you have a lot on your mind, it is important to be able to relax, so that you can continue to think freely. Take regular time out for relaxation. And make time for family and friends.
Relaxing and keeping your brain flexible: you can do this in many ways. In addition to walking, good dining, resting, lazing around, reading or exercising, learning something new is also a form of relaxation. You use your brain in a different way, using a different part, and it can therefore let go of the other things – and thus relax.
Examples of new things: learning to play a musical instrument (and then my choice is piano, maybe not the easiest ;)), learning another language (tip: the app Duolingo), juggling, sewing, carpentry, getting to know edible plants, etc. There are plenty to choose from! And if you want to learn something really well – the more concentrated you are, the better you learn and relax!
Extra tip: don’t give up too quickly, buckle down to something! Set a goal. My goal: within a few years I want to be able to play some beautiful or fun pieces if I should find myself in front of a piano somewhere. That will take some practice :).