Traveling to Ancient Greece, I Brought My Own Trade from Another World!

It doesn't look good. You already have a system, and you don't use the power of the system. You keep letting yourself go, and when you know that others will harm you, you don't use the system to strengthen yourself, but you put it away for your own entertainment. Low demons are also demons, and they can at least deter people. Or you can simply buy hundreds or thousands of slaves and directly suppress them with troops.