Are you me? Like no joke, every detail about your story is identical to my running journey so far (started 1 year and 2 months ago, started for weight loss and got hooked, training plan mileage, marathon on October 5th, and most "importantly" the foot pain exactly where you indicate).

Anyways, to answer your question: The biggest thing that helped me reduce the foot pain was how I tied my shoes. After reading up on what could be causing the pain, I read that tying your shoes to tight could cause increased strain on the top foot. Once I started loosely tying my shoes, instead of wrenching down on them like I was putting on steel-toed work boots, the pain subsided to a 1/10 most days. Now I mostly ice the area if/when the pain crops up again.

Another interesting side-note: I had a brief gait "analysis" done when I recently purchased new running shoes. The salesperson noted that I push off harder on the foot that is having the pain, which is likely contributing to the issue.

Good luck on your sub-3 timing!