Yup. Wrist strengthening excersizes for sure, and goig lighter at first on the bag, focusing on technique.
For strenthening I reccomend tight grip bench press (focuses on the triceps, but you have to balance the weight with your wrists so it will help. Also a lot of forearm excersizes. try picking up the biggest dumbells you can and just moving your wrists in as many directions as possible. Do some wrist curls with either dumbells, or a barbell, making sure to curl with your palms up, and then palms down to get both motons in. and maybe hold your arms like your doing hammer curls with dumbells and move the weight up and down. It really helps. When I started hitting the bag I used to mess my wrists up all the time. After about a month of doing those excesizes, I can go full out even without wraps and not have a problem.