Getting enough sleep is paramount for me. Otherwise I am an irritable mess. After that, probably exercise, mindfulness, meditation. All of those are definitely helpful.

In addition, I need to let myself actually feel the emotions - so checking in with myself about how I'm feeling regularly. If I don't do that, it builds up into worse anger/irritability/frustration. I'm finding that acceptance is key - and not trying to justify things too much. So if I'm happy, I try not to question it, and if I'm depressed, I try not to beat myself up for being depressed. That's what works for me.