Received an incredible offer (global macro). Don't know how.

So I just received an offer to join the macro strategy team of a BB. Focused on FX and fixed income strategies.

Truth is, I don't really know how I got here and where to go from here. I have an undergrad degree in econ from a semi-target, worked in an econ consultancy for a few years, got the CFA for some reason and now somehow got an offer for this. It's strange because they emphasized econometric modelling in the interviews and I made clear that I didn't have much experience with it since college, but I still got the offer somehow. I don't even have a masters degree, which I thought was a prerequisite for these kinds of jobs.

I've always been pretty passionate about macro developments, geopolitics and all that, and I'd love to build a career in it. I guess they liked my insight into politics in obscure parts of the world? IDK. Given time and some training I could get up to scratch with the quant stuff - I was ok in college I guess, but I still feel like they're overestimating my skills. I have this nightmare of showing up to work on my first day and being expected to build some complex econometric model by myself.

Basically: 1) Does it sound like I'm in over my head here? Am I overthinking a great opportunity? 2) I don't have the temperament for trading. Excluding that, what's the next move for a macro strategist? Is buyside research an option? Is the skillset too specialized to transfer out of finance and into a general corporate? 3) Ignoring 2), do people tend to stay in macro strategy, and if so why? I get that it's intellectually stimulating, but how does pay/lifestyle rank?