The empire you're building is intended to grow with you, and the game is implemented so that there is no true benefit in resetting your progress.

Please note that it is not possible to build any "wrong" buildings in the game. You will end up getting all the possible buildings as the game progresses. 

In theory, you can reset your progress by deleting and then re-installing the game. However, if you are using Game Center (on iOS) or Google Play (on Android), your previous progress will be automatically recovered.