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You are off to a great start! I would suggest continuing taking as many classes in each of those areas as you can. See if you can join any clubs on campus (Psychology or Sociology) so you can attend conferences and network.
Education wise, your next step would be to start looking into Social Psychology Master's or Doctoral programs. You can start this early, so you can see exactly what they are looking for. You can see GRE requirements, GPA requirements, and if they prefer you have certain experiences.