openasocket has made good suggestions in a sibling comment. I would add that one thing that can be illuminating is works by professionals (whether current or past) recommending new directions; reading about arguments for paths not (or not yet) taken can provide a broader perspective.

(It's been a while since I’ve spent time with this; one which I remember finding interesting was Breaking the Phalanx: A New Design for Land Power in the 21st Century. [0])

[0] https://www.goodreads.com/book/show/1597250.Breaking_the_Pha...