As an intermediate disc golfer, I am wondering what everyone would say their greatest tip would be, whether it is about driving longer/straighter, putting more accurate, or just a general tip about the game.
One of the biggest things that has helped me over the years probably more than anything else (aside from tons of practice) is playing with people that are better than me as often as possible. The more you watch someone play that is consistently better than you, the more you learn on what works and doesn't work with certain techniques.
Also, when playing with someone better than yourself, you have a mindset to play harder and push yourself more than you would if you were playing with someone that you are much better than. Other pluses is that better players tend to make better decisions and that is contagious usually.
Another thing I like to tell newer players is to do whatever you can to keep the courses clean. If the courses don't stay clean, they won't be open.
If you see recreational players (or anyone for that matter) littering or vandalizing the course, I suggest letting them know that they are wrecking the course and that they are contributing to the course being closed. No one likes playing on a littered and vandalized course.