Free: Contests & Raffles.
I would stick with 54 pounds for this season. Uncle Ted shoots his bow somewhere in the 50-60 pound range.If you can shoot a good group at 30 yards, and you are at a legal bow/arrow weight. I'd stay put. You will get stronger over time.
I've been stopping when I first start getting sore: around 30 arrows. I think I should continue shooting, even if the form starts to deteriorate, simply to strengthen the muscles. When it's time to hunt, I need to use a weight I can handle.