Great people pictures!
Most of the assignments I related had to do with overcoming reluctance in getting in front of people and getting the job done. Looking at your online portfolio...well...obviously you're already there.
You already know what you need to do: Select a universal concept that drives you and FIND that concept in your people pictures. Find an angle, work it for 18 months, find another angle and go another 18 months, repeat, repeat, repeat. You will then have defined your personal vision and leave the world with a very unique and distinctive viewpoint.
Otherwise, there is no point to this whole business.