Do you have any reprint requests? Did anybody send you request for technical help? Are you invited to join any Professional Societies? Are you invited to submit the paper or abstract to any journal or professional conference? Have you ever been tutoring young students or residents in the research etc. Have you even been invited to give a poster presentation or oral presentation of your work? Have you ever been invited for paper review? Did you have any photos to show that you stayed with some famous guy in any professional conference, etc? Have you ever been a PI or Co-PI of any grants anywhere? Is the impact factor of your journal more than 4 (if so, amplify its impotance)?
You may have one or two of them but you did not pay attention to. Try to collect as many as possible.
Good luck.