Murder them!
You are in the trimming group I see.
We had a couple crape myrtles at our last house and I would cut them down to a couple sticks 12” long and every year they would grow. 12’ or so. Not nearly as pretty as the ones @Taco Loco has though.
One of the women I work with loses her mind every year when the landscapers cut the crape myrtles at their office. I have thought about getting some for a natural barrier along the back of my property but never messed with it much.
it mustmus been poured at 4:45PM on a Friday