Keep trying for jobs or go get masters?

I have a job at an M&A firm now but it isn't very technical/analytical, so I'm not doing modeling or going over financial statements, etc. I'm mostly communicating with PE firms, business owners, and hiring/managing people who are prospecting for business owners who may want to sell. I've found my experience at an M&A firm gets me interviews easily but I don't usually make it far. Recently I had an interview with a relatively small PE firm, they were the ones that reached out to me. But when we started talking about more technical things they decided they didn't want to continue interviewing me. I'm now talking with another M&A firm about a job that would require me to do financial modeling and be more technical, exactly what I'm looking for since this is what I want to learn. I exceed all the requirements in the job listing, they even are looking for people with 0-2 years experience. They liked my resume enough to keep talking but they are now asking more about my technical knowledge and unless they take a chance on me (obviously I think I can learn quickly, I do have surface-level knowledge on the more technical things they want) I don't think I'll get this job either. FWIW, I have been working in M&A for just over a year, I am 23 and just graduated in May

Now for my question. I have dual citizenship with an EU country. I can go to Europe and get a masters for nearly free in finance. Some of the universities I have looked at have specific finance masters programs where they go in-depth with a lot of what needs to be known for IB, and I think I would come out of school with the knowledge I need. I really don't like the idea of going back to school now and losing out on a year or 2 of work though. Either I do that or I keep applying for jobs/trying to learn on my own so that I can finally get a job in IB where I can be around the technical stuff every day (basically exactly the job I'm trying to get now). What do you think I should do? 

If you've made it this far in my post I really appreciate it, I'm questioning myself a lot right now and feel lost. I'm not sure of the next steps I should take and would appreciate any advice.