 If you're just saying yes and no to things based on your mood or how you're feeling, there's no consistency in that. For me, I've learned to be able to say no respectfully, with tact, and to be polite if something is not a good fit. If you're asking me to do something that is taking me away from that North Star, then it's most likely not the wisest investment of my time or energy, and I'll politely decline.