Start as a Slave and Secretly Upgrade

I thought I could be reincarnated into another world and become Long Aotian, but instead I was born as the son of a slave. Not only did he not have a name, I had to start working when he could just walk. It was so inhumane! Fortunately, there is also a proficiency system, and you can increase your proficiency just by working. In order to survive in this world full of magic and fantasy creatures, I decided to develop secretly as a slave! And then turn into a slave and serve as... Cannon fodder on the battlefield?