Congratulations on recognizing the need for method and structure in your flying.

One approach you might try is to have a specific plan or goal for what you want to do on each flight. It doesn't need to be elaborate or complex, just form a habit that you know what you want to do before you even start up the engine. Work on basic maneuvers, such as the loop and roll. Make loops that are bigger and bigger, requiring you to fly the plane through it, not just hold back the stick. Try 3 consecutive loops "in the same air", if you can. Work on axial rolls. Try slow rolls and then real slow rolls, keeping the heading and altitude constant. Try 4 point rolls. Easy to say, but hard to do! When you do cuban eights, be as precise as you can as to entry points, roll position and exit point. Do stall turns with an eye on making sure the vertical is on target. Fly inverted traffic patterns around the field so you are completely comfortable with inverted flight. Practice landings to a spot on the runway, and choose different spots, just to keep it interesting.

You will find that the more complex maneuvers are simply more complex combinations of the simple, basic moves, but require precision and timing to make them complete.

Have fun!