How do you find the energy level for that mindset, with so much despair and apathy surrounding you.
If you want to see negative, demoralizing shit 24/7 it's right at your fingertips. However this is not your reality, and not the reality of most people on earth.
Everyone I know who has high energy levels takes their sleep, diet (and weight), and exercise seriously. Anecdotally, when I have these locked down, I'm a different person.
Obviously this is easier said than done, but I suspect that optimism is much easier for people covering these basics.