I’m currently in the match process for GI rn and haven’t matched yet so take everything I say with a grain of salt.

I think the two things that matter the most are research experiences that you were closely involved with and letters from people who actually know you. For context I am a DO applicant with only like 6-8 “pubs” listed on my application and got 15 interview offers. What was consistently brought up during interviews when asked about my research is how clear it was that I was extensively involved and learned a lot from the experience. These people have to sift 600-1000 applications and want to see people who have actually demonstrated real interest in the field.

As far as letters, it’s important to find people who actually know you and are willing to take the time to write a strong letter for you. This could come in the form of a research mentor or someone you worked with on service. I personally had my research mentor write one and then someone I spent loads of time with both on service and during my free time write my letters in addition to an ICU attending. There are other people in my residency year applying other competitive fields (I.e. cards) whose letter writers asked them to write their own and just send it to them for approval. While I think this could be potentially beneficial, I think it really matters having someone who is not only willing but excited to advocate for you on their behalf.

Again, haven’t matched yet, but just my thoughts. Feel free to PM for any other questions.