Was there a book that recommended that the protagonist was a person from the future world, who was reborn in another world, cultivated, and established an empire?

The main character was first reborn as a member of a primitive tribe. Then, he became the tribe leader and led his tribe to become stronger. He also had to participate in the trial mission.
What you guys said was wrong. But I still have to thank you.
The novel I want is about the protagonist's rebirth. He uses the knowledge he had before his rebirth to make his tribe stronger step by step.
Moreover, the king of every country had a power stick that could be used to buy technology, weapons, resources, and so on.
Also, everyone could cultivate martial arts manuals to increase their combat strength.
The planets with the highest civilization seemed to let the countries with lower civilizations participate in the trials every year.

Answer 1

I recommend "Downloading Life" to you. The main character, Lu Ming, is a person from the future world. After being reborn into another world, he obtained a mysterious instrument. Through this device, he could look at what had happened in the past at any time, specify to pause what was happening, and predict what would happen in the future. He relied on this divine artifact to achieve great commercial success and began to cultivate Chinese martial arts to strengthen his own strength. I hope you like this fairy's recommendation. Muah ~😗