Improving 10k with regular training

[MMS]

Hi Coach,

last week a missed a couple of runs because of work, but everything else was fine.

Yesterday I had the 4k time-trial (same course as previous) and was quite surprised with what I did. See below:

May 9th 4k time-trial
temp:17C
K|Time|AHR
1|04:10|166
2|04:16|181
3|04:13|185
4|04:00|187
Tot|16:39|180

Compare to last year´s:

Oct 18th 4k Time-trial
temp:21C

K|Time|AHR
1|04:04|169
2|04:07|186
3|04:09|187
4|04:09|188
Tot|16:29|182

It was a bit windy last night and I had to struggle more during 2nd and 3rd km (It´s a 3k lap, so 1st and 4th are the same). My theoretical target was 4:15/km, I didn´t know if would be able to do it. When I finished the 1st, I knew I had to slow down a bit, and i did because was afraid i wouldn´t make it.
I did what i could do for a 4k. What I mean is it´s a pace i wouldn´t hold for longer distances, specially because I had a sprint during the last km.

Now, how would you fit me in a 10k program?

Cheers

MMS