This year, I should have written more. I should have exercised more. I should have cleaned more often. I should have spent more time with friends. I should have called my parents more often. I should have studied harder, eaten healthier, laughed louder, and taken more chances. Causes: worry, busyness, laziness.
Mostly, I should have dealt with interpersonal problems instead of being passive-aggressive about them or just being bitter and never speaking to people again. Main cause of this problem: fear.
As for the bonus question: I will do my best to do all of these things, but I only have so much time, energy, and courage. I'll make what improvements I can, and those I can't will wait for another year.