Advice needed - switching from a Big 4 to an IB firm

Hey people!

I've joined Deloitte USI's (Offices of the US)  Risk and Financial Advisory practice, where I'll be focusing on the "compliance and regulatory" vertical.

While this is irrelevant to investment banking, this was one of the few good opportunities I got since I'm not from a target school.

Four years from now, I intend to go for an MBA post which I would like to either move to private equity or investment banking or even management consulting (M&A advisory), depending on the prospects.

In India, BB investment banking firms usually don't hire an undergrad directly; they either expect you to have 1.5 to 2 years of relevant work experience or to have cleared specific professional courses like CFA and graduated from a tier-1 college.

I want to work at my current job for six months or so post which I'm planning to switch.

To anyone reading this, how do I get into investment banking (M&A advisory preferably) within the next two years? Which firms should I switch through before getting there, and how do I navigate starting from my current role? What roles and domains should I focus on to gain relevant experience?

PS - Any other relevant suggestions are welcome as well. Thanks!