Why didn't anyone revive the Holy Roman Empire?
The Holy Roman Empire was not revived due to several reasons: it was an inefficient and outdated institution, the rising power of Prussia created tension, Napoleon's reformation of Central Europe, the creation of the Confederation of the Rhine, and the proposal of a new union - the German Confederation. Furthermore, the Austrian rulers, the last dynasty of the Holy Roman Empire, had no interest in its revival due to the empire's lack of centralized power and the potential for outside powers to undermine Vienna's power.
via Why didn't anyone revive the Holy Roman Empire? (Short Animated Documentary)