Over 50% of our New Year's resolutions fail. That's because too many resolutions are based on societal standards, not what's best for the individual. Keep your goals specific. For example, "I want to lose 10 pounds" instead of "I want to lose weight." Keeping track of your progress in a journal can help you stay motivated. Take your time. Getting impatient with yourself can cause you to give up.
If you're trying to break a habit, it's a good idea to identify the "cue" that triggers the habit. For example, checking social media because you feel lonely. "Small number theory" can help you stick to your guns. Instead of thinking about how much further you have to go, celebrate your progress — no matter how small!