A shorter and higher stem would be a good place to start. How short and how high? Well, unfortunately, unlike clothing stores, bike shops don't have fitting rooms.
So you have two options: 1.) talk to someone at your LBS and let them know what you want to do. Buy a couple of stems (they'll love that) and experiment. 2.) Get a bike fitting. This was you pay your money, get to experiment, and leave the shop with a stem that fits your riding style.