What exercises for utility Category?

[Fabry]

Good morning everybody, flying on my friend’s RV7 I discovered that I love to do aerobatics, but at the moment I can’t afford an aerobatic airplane, I’ve started a fund for that but it will Take "a couple" of years to get there.
I currently own a low engine hours American Aviation 1971 AA1A which I really love, except for the fact that is only Utility Category rated, now I know that True aerobatics maneuver are out of discussion for this airframe, but I was wondering if you aerobatic expert guys can suggest me if there are some exercises that I can perform with this airplane that may be useful to improve my piloting skills toward aerobatic purpose.

My experience as a pilot is about 600 hrs of which 450 in Gliders where I had some basic aerobatic training like loops, rolls, spins, hammerhead turns and I than exercised on those whenever I had some altitude to burn.