I recommend the novel " Ming 1593 " to you. The main character traveled to the Ming Empire and was able to beat up the Japanese pirates and colonize overseas. He also had a system that allowed him to complete missions to exchange for all kinds of things. There was even a royal family who wanted to give him a princess. At the same time, he was also called the rule maker by the merchants. He was very powerful. This novel fits your requirements of unifying the world and colonizing the outside world. I suggest you take a look! I hope you like my recommendation.😗