Start with the little things you can change. Environmental noise, can you get headphones or earplugs? Social media making you feel down, curate your feed, change sites, or even take a breather. Change up a routine, try a different food, or a hobby. Whatever is in your power, a novel experience might be an idea. Decorate/personalize your space. Add some lights, tapestries, whatever you like. These are some ideas I’ve tried personally and enjoyed a few of.
I think it has applications, none of them involving a street fight or confrontation. I dodged a fist coming my way from a partner once. Most of the time I use it to take blows properly and redirect aggressive people with whom I work. I want to add with all of my knowledge, almost everything I know would be useless against someone much larger than me.