Military and spy gigs? They're reasonable fallbacks and do make some sense, as they keep those supermuscles flexing. Wonder Woman, Black Widow, Captain America, and others have made a go of it. But, really, who wants to spend their off time fighting more crime and villainy? That's like an accountant having a spreadsheet hobby.
There are certainly new opportunities out there for the mild-mannered. With a little investment and training, a superhero can make the transition to one of these rewarding new secret civilian careers.