Not changing your strategy merely because you're used to the one you have now is a lousy strategy.
You win by trying. And failing. Test, try, fail, measure, evolve, repeat, persist.
If you could do tomorrow over again, would you?
Art changes posture and posture changes innocent bystanders.
Lack of resources (payroll), time and competing priorities are why so many nonprofits haven't done well. It's that simple.
The best time to start promoting your book is three years before it comes out. Three years to build a reputation, build a permission asset, build a blog, build a following, build credibility and build the connections you'll need later.