Everyone changes their job: Even gods are my material for training dragons

The universe changes, games and weirdness come to reality, monsters are rampant, secret realms, and dungeons. There are countless horrors, and the myriad races outside the Nine Provinces are eyeing them covetously.
This is an era of job transfer for all people. Only by becoming a professional, upgrading and becoming stronger can you participate in the great struggle in this world.
Cao Xiaochun, who traveled through time, awakened the only hidden profession on the day of job transfer: Gu Master. But this profession is recognized as the weakest profession in the world.
The strength is not as good as that of a warrior, the magic power is not as good as that of a mage, and the physical fitness is not as good as that of a priest. It is definitely a scumbag profession.
Fortunately, Cao Xiaochun awakened the God-level Gu Master system. With the assistance of the system, Cao Xiaochun has embarked on an invincible journey since then.
"Gu Master is obviously a powerful profession with high light and righteousness, so the name of the Demon Refining Heavenly Venerable given to me by the myriad races is all rumors!"
"The King of Light, right? I still lack one material in this moment, so please go to Danghun Mountain today!"
When Cao Xiaochun swept everything with his Gu insects, the whole time and space trembled.
Gu Master is the weakest profession? Gods are all my Gu-making materials, okay?