Reborn as a Cauldron, I Turned Myself In to the Government from the Start

[The protagonist doesn't become human again. The army is the real protagonist.]

As humanity stands on the brink of extinction at the hands of alien races, Zhang Qingyuan, the strongest among the surviving humans, chooses to sacrifice himself to the Divine Cauldron of National Protection in exchange for one chance to start over.

The divine cauldron accepts Zhang Qingyuan's sacrifice.

But after being reborn, Zhang Qingyuan discovers that he has become the cauldron's artifact spirit. If he wants to speak, that's easy: he just has to pay up...

When the museum's security guard on duty brings his flashlight over to the cauldron to check his phone, the flashlight disappears.

And then the bronze cauldron speaks...