There's really nothing that you aren't already doing... however, if you really want to "go for broke" and, because you will never have as much time on your hands as you do right now, I would advocate starting to run two hours per day, each and every day. Start easy. Don't count miles. Just start running the time. Running for mileage will just get you injured.
Something like 45/75 each and every day. A two hour run on the weekend. Run hard when you feel good, run easy when you don't. Do everything else you are doing and lots of striders. Eventually, you will get fitter and fitter, spending the same amount of TIME on your feet each and every day. So, your mileage will naturally go up.
I know some would say this isn't necessary for the 5k, but it would help at all distances, xc, 5,000 and 10,000, marathon, etc. If you really want to break 14:00, you must have the massive aerobic base to achieve it, even if you eventually refine your running to doing more track-specific workouts. I think even JK's (of lets run fame) manifesto suggests 120-150 mpw week over and over to achieve your best. But you can't go straight there. You can, however, start running two hours per day. If I had it to do over again, this is what I would've done.
Good luck!