What interactions have you found improve your Sim's reputation. I have a 3 star Sim who is always nice to everyone - signs autographs, takes pictures, donates to charity, etc. but the reputation is ne...
Take your Sim to a lounge/bar with a group of friends, and have them buy a round of drinks. Your Sim should also introduce themselves, sign autographs and chat up the locals. Just have them be nice. :)