Regularly send small gifts to their staff. Call every morning to find out if they have any auditions lined up for you. If you are not getting the type of auditions you want, tell them you have been approached by another agent - even if you have not. You will quickly be sent to the right type of auditions. If you are truly talented, your talent will be noticed and rewarded.
Talent is assumed.
Actors who realistically knows themselves have a big advantage. Graduating from a big-league acting school will write your ticket to Hollywood. One big movie deal and you're set for life. Commercials are excellent training for film work.