Increase your confidence with mock interviews. From my past experiences, I have realized that not every mock interview resonates with real life interview experience. Free pramp interview gives little to no experience with zero effective feedback.
An interview is about your attitude, your approach, and how you end in resolving a problem with a limited time constraint. You need to know how to communicate with your interviewer effectively.
At the same time, you need to assess your new role, the team and expectations as well.