The Industry Context

Once you pick an industry it can be defined with a simple equation

Industry — Demand, Supply, Exchange — Value Proposition

For example:

E-commerce — Buyer, Seller, Physical Products — Supply Chain (Fastest Delivery, Widest Selection, Lowest Price), Ex: Amazon, Flipkart, Rakuten

This context will let you then choose which part of the equation your problem statement lies in. Is it the demand, the supply, the exchange or the value prop.