[jamessantiago]

Just like the other comments here I'd suggest focusing on mindset and health. For mindset, I'd recommend looking at stoicism such as with "A guide to the good life." In particular, the parts about accepting reality as it is, sort of like the serenity prayer. I like to think that I go into work with the mindset of giving 100% and should therefore not feel dejected by negative occurances. If I'm not fit for a task, that's ok, I'll either grow or I won't, but I can't expect myself to magically go beyond my full effort no more than I could grow beyond my height at that moment.

Also, health. It always seems to be just a little too imperceptive to really drive home how little things make a big impact. Sleep no less than 8 hours, eat no more than your recommended calories, be active for no less than 20 minutes (walking, cardio, strength, etc... ideally to your target heart rate), and foster strong relationships [1]. Additionally, try to understand what drives your behavior: why did X make me feel Y, and take control of that causation. Seek therapy and read into behavioral literature to better understand yourself.

[1] https://news.harvard.edu/gazette/story/2017/04/over-nearly-8...

[mr_custard]

Can confirm that this book helps. I read "A guide to the good life" and practised stoicism at a time when my anxiety and stress levels were high. Very useful comment and it's great to be reminded of the book here.

[rconti]

Also, the book "Mindset".