If you get to the end of an interview and want the job, don’t be afraid to tell the interviewer that — don’t be afraid to ask for the job.
As you wrap up and say good bye, tell the interviewer (using wording that feels natural to you) that you’re interested in the role, that you feel you are a strong fit, and would love to continue with the process. By doing this, you won’t leave them guessing as to your interest level, and you may just come out on top of another equally qualified candidate who said good bye and left without reiterating his/her enthusiasm for the role.