Service Academy Grad Career Thoughts- Non Commission

I am a recent graduate from one of the three Service Academies (USMA, USAFA, USNA) and although I just graduated, I was told last minute that I wasn't able to commission into the U.S. military and would have to find a civilian job. I am incredibly interested in joining IB or Consulting but do not know the right way to go about doing so as an applicant with no prior applicable internships or job experience as those kind of opportunities are not available at any of the Academies. I have a 3.8+ GPA as a STEM major, was involved in club athletics, and have strong leadership positions that I have put on my resume. Any advice or recommendations from this forum? Thanks!