I hope you'll find at least one of these career- and life-boosting resolutions worth making and maybe even worth keeping:
"I will answer all email within 24 hours."
It's okay even to respond, "I'm swamped. Will get back to you in 2-3 days." But not responding at all within 24 hours makes people pull out their hair, and that's not good for your career. Abbreviated reminder: Answer email!