Ask for favors and advice
Obviously it's important to be useful to get on your boss's good side. But a lesser-known, way cooler way to score points is to make your boss feel useful by doing you a favor. It's called the Benjamin Franklin Effect, and here's how it works: essentially, you ask someone for help and make it clear that this person's special skill set is just what you need to get the job done. Not only does it make them feel valued and important, but subconsciously they'll know that if they did something nice for you, they must like you. Similarly, asking for advice will make people more likely to agree with you.
Look physically bigger and more confident
Feeling insecure at work? That’s gonna reflect in your body language, which will have a major impact on how supervisors perceive you. Carol Kinsey Goman, PhD, author of The Silent Language of Leaders, recommends taking up physical space at the office to convey a sense of authority. Sit with your legs about hip-width apart, or spread your belongings out to use all the space on your desk. If you're stuck in a confrontation, slightly angling your body away will help to defuse the situation.