I think I really good idea to put a foundation down for the next year would be to train for a fall half marathon over the summer.
The volume will be Mid-High but the intensity should be Mid-Low very tolerable and and easy way to get in more mileage and set yourself for a good 5k in the not to far future.
Following a Canova Build up you would have
4 weeks of introduction which involves Speed First so 2 weeks would look like
During these first two weeks you increase the mileage as well.
Sunday Long run
Monday: easy run + 5 x hills sprints
Tuesday easy run
Wednesday: Mid long
Thursday easy + 5x hill sprints
Friday easy
Saturday Easy
Next two weeks you continue to build up mileage and introduce easy workouts. In reality should be around your close to peak mileage you would like to run at around week 5 or 6. So if that is around 80 miles a week in 10 runs you would get there and most likely be tired in the beginning but then adapt as you maintained that throughout the summer and continued to increase your ability to extendyour specific endurance (Half marathon Pace.
So next two weeks would look like.
Sunday Long run
Monday: easy run AM. Easy run Pm + 5 x hills sprints
Tuesday Fartlek run
Wednesday: A.M easy run P.M Mid long
Thursday easy
Friday Tempo 15 min @ Marathon 3 min cruise 10 minute @ half Marathon
Saturday: A.M easy P.M easy
The next 6 weeks of fundamental basically Follows the same pattern but it give you the opportunity experiment with your long run and Also extend your ability to run that Half Marathon pace.
A good book to buy to get a good map for this training is Brad Hudsons Run faster from 5k-Marathon book.
I do not know if this is the answer you wanted to hear but I am advocating that you train for a half marathon because it is very closely related increasing your lactic Threshold and overall Aerobic capacity. As a distance runner you are going to make the greatest improvements in performance by increasing these two things.