Before tactics comes strategy, but before strategy come the Principles of War.
The GOP has failed because it has not developed cohesive principles upon which to found its strategies and tactics. What passes today for strategies (i.e. no new taxes) are neither. They goals without principles.
The GOP needs to return to its foundations of individual liberty, individual freedom, property rights, and individual responsibility. Goals, objectives, strategies and tactics should be the natural extensions of those principles.