Mine is modest; but practice being mindful of your emotional reactions.
If something upsets you, interrogate why, and whether your reaction will help. 90% of the time it won’t, so learn to appreciate that you are upset, but don’t let it control you. Because if you don’t you’re going to start seeing the world through incredibly negative eyes.
For example, I used to be a nightmare behind the wheel, always getting angry with shitty drivers and red lights. But I began trying to catch those thoughts, and asked myself whether they would stop other drivers being shitty, or whether it would stop me getting caught at red lights. Would I still be angry in ten minutes? The answer is almost always no, so to expend that energy feels like a waste of time to me now.
Sure, I still get pissy, but I don’t sit with it for longer than I need to. You wouldn’t sit in acid, so why sit in anger?