Hi,
I'm a re-applicant and a MS1 now.
I'm not sure what were the exact things that helped in my re-application. What was different between my previous application and the latest one was my involvement in volunteering work and medical attachments did help. I also took part in the Prehealth Experiential Programme 2018 but not sure how much it helped.
I think what is most important is highlighting on how you've reflected on your previous application.
Hope that helps. You can PM me through this forum if you want to find out more. =)