Peace calm quiet stillness, usually, when the body (and therefore brain), is well fed, rested and exercised, the mindset is strong.
If not, maybe a good mindset practice is useful.
To focus the mind on a basic idea that is nurturing is the best idea: peace, calm, quiet, and stillness.
Sometimes it is good to discover what is weakening your mindset.
When you think, are you distracted by things you do or devices you are using?
Try thinking or doing, either/or, try doing one thing at a time.
Practice being mindful of being at peace, calm, quiet and stillness.
Try all the above ten minutes a day and then decide if it is worth doing daily.