Creating opportunities for yourself like contacting up-and-coming film directors can do wonders for your career if they like what you do, so keep at it, and keep creating music, demos and stuff people can listen to.
You can never give up and you have to believe in yourself when no one else will. You can have all of the talent and chops in the world, but you have to be prepared to eat macaroni & cheese 3 times a day, live in a roach infested apt and accept rejection with dignity.
Work hard, never rest on your oars, listen, constantly work on your skills, never give up because sometimes opportunities arise by coincidence and always be your toughest critic.
Don’t try to be the next Hans Zimmer or John Williams and try to sound like them. Hans Zimmer is already the best at being Hans Zimmer, and John Williams is the best at being John Williams.
It's important that you can do what you say you are going to do, so try not to oversell yourself if you've no chance of delivering on it as it will come back to bite you later!
Always, ALWAYS believe in yourselves. Talent is nothing if you don’t believe in it. Do not waste time listening to opinions of people you don’t admire.