Remind yourself of the victories as often as possible.

To become psychologically and mentally stronger, you need not only to overcome yourself, but also to remind yourself of victories as often as possible. Every day write down in a notebook or in your smartphone notes a few things that made you feel grateful during the day. That way, after a while, you'll be able to figure out what brings you the most positive feelings and what you should focus on. I associate such an effect with improvement of the general psychological state, better quality of sleep and reduction of stress, because meaningful positive emotions relax the psyche.