You need to be the type of superhero who can intercede and stop crimes in progress - not just play detective after the fact. No precognitive stuff either. You need to have some kind of physicality to pull off the derring-do yourself; you can’t just document a crime and call the police. And you have to be able to successfully do this year after year, so consider wear and tear. Your enemies will not be super but real world murders, rapists, arsonists, thieves, terrorists, etc.
So a cosmic being charges you with protecting a major metropolitan area, opens his grab bag of powers, but warns you to not get greedy. Take what you need to pull off the above. Nothing more.