I would disagree that running a half requires 40-50 mpw. I didn't go above this for any of my marathons and did many halves on 20mpw
OP, my advice would be to focus on a training plan. There are plenty online that are free of charge (eg runners world) but broadly you need to vary your running. Think:
1 slow easy run (Monday) 4 miles (145bpm)
1 interval session ideally at a running track doing something like 5x800m with one minute break at goal 5k pace
1 longer run (eg 10k at a mid pace at 160bpm
One thing to bear in mind is that running is not rocket science, broadly you are training your body to get faster for the same output.
More miles, less weight, better technique and more speed sessions will achieve this
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