You're in base phase for an XC season that's 6 months away where you hope to go 16:30-16:45, which would be a big jump. What that means for you right now is that you've got some time to build steadily, both aerobically and your high-end speed.
What does that look like? There are three components.
1) Gradually increase your mileage. Usually a 40 mpw week guy? Spend 2-3 weeks getting up to 50 and then hold there for a bit before seeing if you can do 55. (Take a week where you drop mileage 20-30% at lest once every 4 weeks, if not once every 3 since you're building.) Usually a 55 mpw guy? See if you can build to 65 and then 70. This (taking your peak volume up a notch or two from its previous peak) should be the primary focus of your next 8-10 weeks.
2) Maintain and build on your strength (which is your strength). Do a run of at least 90 minutes at least every other week. If you're feeling good, pick up the pace the final 30 minutes, or work hard on the uphills (finding an uphill of 1-2 miles and running steadily hard up that a couple times a week is a good idea, too). Integrate 1-2 of these types of workouts every week while building your mileage, and once you're comfortable at that new mileage 10-ish weeks downrange switch to more formal workouts once a week--20-30 minutes "comfortably hard" (for you that's probably around 6:10-6:30 pace, depending on the terrain), 3-5 x 3-5 minutes hard uphill with jog-down recovery, 4 x mile @ 6:10 w/ 75-90s recovery or 8 x k @ 3:50 w/ 60s recovery on the track (slower if on a road or cross-country course, especially if it's hilly). Every 2-3 weeks replace it with something a little faster like 5-6 x 800m @ 2:55-2:50 w/ 400m easy jog recovery (or 6 x 3 minutes at 5k effort with 2 minutes easy jogging recovery if you don't have access to a track or trail with measured quarters) or 10-15 x 400m @ 85 cutting down to 81-82 w/ no more than equal recovery. These "little faster" workouts shouldn't be too taxing, and if they are, slow them down by a few seconds and/or don't push it on the number of reps.
3) Take this time to do some foundational work to address your weakness, which is speed. While building your mileage, integrate a 10-minute drill and strides routine before every run (2-3 sets of 15-20m each of A skips, B skips, C skips, and toe flicks--if you don't know what these are, Google them and 3-6 x 80-100m strides of 40-50m accelerate, 20-30m maintain, 20-30m deccelerate). Once you've done 2-3 weeks of these, you can add a speed development day per week to your schedule (running 4-6 x 8-12 second hills or 50m flat rolling start all-out flat with 4-5 minutes easy jogging recovery in between). You can keep all of this (the every day drills, the almost every day strides, and the weekly speed development) as a part of your schedule throughout this entire base phase. You can also add something like an in-and-out mile (run the straights hard, jog the curves easy) or 4 x 200m at 800m effort w/ 200m easy jog recovery at the end of a tempo or hill workout every week once you get to that phase.
Also, if you don't have a good lifting and core routine, now (at the beginning of this training cycle) is the time to find one. A couple 20-30 minute lifts on top of 5-6 days a week of core will go a long way toward making you injury-resistant as you try to do new things in your training. If you don't have access to a gym right now, you can do a lot with body-weight (push-ups, dips, pull-ups, planks, crunches, etc).
This training, done right, won't get you race sharp, but should maintain and build on your strengths while addressing your weaknesses, and give you a really solid foundation on which to start putting race-specific work when cross country season gets going in the fall. And that's when the fun (and breakthroughs!) should begin.