Check your protagonist's profile.
Were there any groups he was part of during his backstory or schooling? You never know the info may come in handy if you put in a flashback or two.
Also how his current business is run can give you ideas, the hierarchy of it, the bookkeeping if any, etc.
Are there any establishments, even like a mall, that he visits regularly, how they are run? These may make for the filler descriptions but they may enrich your story.
Good luck.