Instructions
Perform all pre-flight checks using a checklist. Do not trust your memory. And take your time, do not rush because it has become habit.
Stay current on regulations by reading up. Subscribe to any of the many private pilot magazines to stay abreast of new information.
Check the weather report with every flight, no matter how calm the day may appear at takeoff time. Weather can change, and a good pilot studies the forecast.
Exceed minimum requirements. Federal regulations only require three full take-offs and landings within a 90-day period. Aim for at least three take-offs and landings a month and accrue at least 10 hours of flight time a month. Flight skills get rusty without frequent use. If possible, attempt to fly at least once a week.
Advance your certification by adding on an instrument rating. Although an instrument rating is not required of a private pilot, having the skills to fly by instruments will be invaluable to any pilot and make you a better navigator. Additionally, if you should be caught in bad weather, you'll have the necessary skills to manage it.
Further advance your certification by becoming a commercial pilot. Even if you do not wish to fly for hire, the training for a commercial certification includes mastering more difficult flight maneuvers. Learning these maneuvers will make you a better pilot by improving your control of the airplane.