From: Florida, USA
Since the topic of discussion is Burma, the focus should be on Rangoon. The entire Japanese defense of Burma is based on Rangoon. It's the only source of supply, since you control the coast and Magwe. Supply can come in through Pegu, but it's unlikely that that port has been enlarged (it's a waste of time and resources for Japan to enlarge it). The next source of supply south of Rangoon is Bangkok, but the road/rail network between the two is not so good. Take/obliterate/deny Rangoon and the defense of Burma crumbles. Off the top of my head I don't recall the exact date that British (Indian/African/whoever) troops landed there and captured it, but it was later in the war than where you are now. Even a landing at Pegu or Moulmein would help. At least he would have to divert troops south to contain it, weakening his defense to the north. In the meantime, I would be attacking the city with every bomber in range (well-escorted, at night, day and night, occasionally rest or target something else, but bomb Rangoon).