Enunciation.
Either that, or I suspect you have one of those gigantic foamy things on your mic, perhaps - if so.. take it off. If not - you may be able to EQ some high end into the vocal, but if that causes more harm than good (static/noise, distortion or whatever), than it may be time to look for a new mic that will capture more of the high end.
Either way - it's hard to understand what you're saying because the vocal is so muffled - and, in my opinion, that's definitely what you should work on first.