Sometimes when you start your business, things shift and you either, A. Are no longer going in the direction you intended or B. No longer want to go in the direction you intended.
I am here to reassure you, that's okay. It is better to take control of your direction than to lose control and try to regain it. Do what's best for you AND do what's best for your business.
When is it okay to revamp? Whenever you feel it is necessary. It's called damage control. When you see things not going according to plan, be confident in your decision to take full control and refocus.