Good question. Dealing with time constraints is tough.
Although your work is physical, it’s not specific to your event (a high altitude peak in October). Your work will probably make you tired, but it won’t make you fit.
The best thing that I can suggest is to change the intensity of those after work runs from hard to easy. Continuing to do hard aerobic work without a specific, supporting base won’t increase your aerobic capacity. It will destroy it.
High-intensity training increases the level of acidosis in the muscles. Chronically elevated levels of acidosis destroy mitochondria. As mitochondrial mass decreases, so does aerobic capacity. (Mitochondria are the “aerobic engines” in muscle.)
A lot of unsupported high-intensity training teaches the body to go anaerobic sooner and sooner. You’ll run out of gas sooner than if you slow down your training and build up your aerobic capacity.
For high altitude, this is especially important. At altitude, you won’t have enough oxygen to go hard enough to recruit those fast twitch fibers that are helping you on your hard runs. So training that range without a solid base won’t help in October. More easy runs will be more helpful.
I hope that helps explain things.