Unfortunately my book focuses on the stages right after that - i.e. you have traction and need to scale. There are some good things written on this topic that

Unfortunately my book focuses on the stages right after that - i.e. you have traction and need to scale. There are some good things written on this topic that you have probably seen - e.g. Paul Graham has some great posts on this as do Sam Altman, Michael Seibel and Aaron Harris. On the non-YC side Peter Thiel's Zero to One, Marc Andreessen's archives (on the A16Z site) and Chris Dixon's pre-crypto writings are all great on this topic too....