My advice:

Understand that the book being released by a publisher is not the end point, nor a goal in and of itself.

"Wanting to be professionally published so I can then [fill in your own blank here]" is a much better way to look at it.

Your book is on the shelf (or the e-book shelf)...now what?

This advice also falls under the category of "If you don't like being a salesperson, don't aim for professional publication"...