There are a few simple keys to success, and many of them come from improving the right personal behaviors.

Always be professional. When people pay you good money they expect you to do a good job. You should be worth it.
Maintain a high level of productivity. Don’t slack off. Get things done.
Be a team player. You can’t be a force multiplier if you don’t support the people around you. Team players are worth far, far more than people who insist on working alone.
Be determined to succeed. Sometimes challenges are hard and the solution cannot be easily seen. Those people who keep going are the ones who find the solution.
Show consistent, high-quality work. This will lead to you having a reputation for success, and people will come to you for more work.