Continuing with his training, he set a series of personal bests in 2011, running 6.77 seconds for the 60 metres, 10.39 seconds for the 100 m, and 20.90 seconds for the 200 m. He brought his bests down further in 2012 (10.26 and 20.72), but did not compete at any major events. He began working with a new coach, Bryn Davis, in 2013 and he pairing delivered results. Brown opened the year with a 60 m best of 6.70 seconds and went on to place sixth in the 200 m at the Jamaican Athletics Championships with a best of 20.49 seconds. This earned him selection for the 2013 Central American and Caribbean Championships in Athletics – his first senior championship – and he was eighth in the final and took silver in the 4×100 metres relay, in a team of Oshane Bailey, Andrew Fisher, and Jason Livermore.