What the title says. I'm 15 male and of course as always with living in a capital city someone tried to mug me, i was fine because the guy was a loser and backed off when i ran into a shop. But like a month later and i find myself wishing he would get into a terrible accident. I know wishing violence upon someone is bad but i really wish that guy approaches the wrong person and ends up being a victim himself. How should i reduce my chances of being approached?

I don't take my phone anywhere with me and when i do i never take it out so anything else i can do?