Why Did I Travel Through Time and Become a Cleaning Robot?

Chen Ji traveled through time and he was very distressed. In the past, I saw that other people who traveled through time were not children of different planes. At least they had a fiancée who broke off the engagement forcefully, so he had a taste of what it was like to be poor when he was young. Even if you change your gender and become a woman, you will also be a magical girl who appears in front of others. Why did he only travel through time and become a robot in a maid uniform in an underground research institute, and he was still the least combat-effective cleaning robot! Then let everyone in this wizarding world where faith and magic intertwine sing the praises of the greatness of cleaning robots.