One such way to build a company is to bootstrap a services business and productize. This is a well-worn path to at least modest size. Another way is to create a studio to fire off many ideas and see what sticks. There are more than a few of these right now.
Many companies and businesses are organically conceived and grown over decades. They are complicated. They start with one thing and move into another. They are not neat and pretty. They grow more based on the longevity, character and commitment of the founder than on the inherent brilliance of any one idea. You don't have to have a flash of inspiration which you test and walk away if it doesn't work. Once you employ people and cultivate their loyalty this type of approach is toxic anyway. It may only work in certain little islands like SV.
Many large businesses are built on successive episodes of inspiration, revelation or innovation that occur over decades, with much perspiration in between.
Business growth is like a multi-stage puzzle. Getting to $100k/yr is one stage. Getting to $1m/yr is another. Getting to $10m/yr is yet another. $100m/yr and so on... Business grows as you and your abilities grow.
A creative person figures out how to solve the puzzles, unlock growth and move in new directions.
Everything is possible if you are not beholden to one narrow model of how to start, finance and grow a business. The first key is to know yourself and what you want.