We have probably noticed that much of success depends on communication skills, it may be verbal or non-verbal communication. To improve your interpersonal skills, you must work on your verbal & nonverbal communication. Body language is important in communication. You should smileYou must Improve the Interactions with a positive attitude. Also, you must develop the social and general awareness about things.
If you are at the workplace, you should start taking responsibilities & initiative. Always try to learn easy ways to problem-solving. All these will definitely help you to improve your interpersonal skills.