Carl,
I'm about where you are in terms of experience. I've got the take-off, fly around, and land thing down pretty well. I even do loops, rolls, and stall turns. Of course, I do them at least 2 mistakes high. But like you I've found myself sometimes just flying around chasing buzzards who get within range until the timer on my TX tells me it's time to come down. What I started doing this past weekend is trying to add precision to my flying. First I established fairly small mental boundaries on the field and stayed within them in spite of a 10-12 mph breeze. Then I created a mental box and flew from corner to corner in a straight line without allowing the plane to gain or lose altitude and turning the corners at the chosen spot. It was harder than I thought it would be. Finally, I pushed a short stick into the dirt on the field and worked on seeing how close to it I could make the wheels touch. It may not sound like much but it has put some challenge back into flying.

As someone else mentioned, start using the rudder. You will need it if you ever decide to fly scale or semi-scale models. I'm flying the larger Park Zone Albatros WW-I biplane and it really needs the rudder to initiate a smooth turn. It tends to wallow if I do a bank-and-yank.

Take care across the pond and try to not have too much fun!
John