ECM/DCM Analyst about to quit

Hi all, I am a 1st-year analyst at a BB IBD Capital Markets Team (think ECM/DCM) looking for advice and perspectives on getting out - currently debating between recruiting for smaller MM IBD or re-recruiting by doing a master's degree (think LBS/LSE/MIT/HEC).

Some background:

Completed my summer internship in 2019 and received a FT offer saying I would likely join a sector team but was eventually placed in ECM/DCM. 

Tried immersing myself into the role, but given the nature of ECM/DCM, I genuinely learned more during my 2-month summer internship working with sector teams than during over half a year as a full-time analyst in capital markets... and feel like I am just wasting my time here.

Due to office politics/culture it will be unlikely to move internally - the group's culture isn't very supportive (some juniors on the team previously got screwed over because of this).

My goal is NOT to move to buyside but to exit to corp-dev / strategy at a F500 after 4-7 years of IBD / consulting, where I hope to learn as much as possible and after which to potentially pursue an MBA. 

I understand it will be difficult to switch to BB IBD at a non-capital markets team as I have been contacted by numerous headhunters but they all got disinterested after learning of my background. Do you guys think it's better for me to do a Master's in Finance and rerecruit for BB IBD / Consulting or to downgrade to a MM IBD team? Either option would likely require repeating analyst years.

Thanks in advance for any feedback