A trail through the mountains, if used, becomes a path in a short time, but, if unused, becomes blocked by grass in an equally short time.
When you say you'll meet someone at 11:00 AM, be there at 10:45. When you promise a check on the 30th, send it on the 28th. Whatever you agree to do, do it a bit more. Start with your employees, then extend it to everyone you deal with. News will soon get around that you are a person of your word.