O&G Engineer Breaking into Consulitng

A bit of background on myself:

Graduated with a Bachelors of Engineering (1st Class Hons.) in Mechatronics Engineering. Have hit my 2 year mark now at a supermajor O&G firm as a Maintenance/ Mech. Engineer. Working for two years now I realize I do not want to be an engineer anymore. Painstakingly slow career progression, regardless of how much of a star performer you are, and very little challenge. I feel like I could produce the same results by working 20 hours a week rather than the 40. There just aren't many opportunities to push yourself and test your limits in this industry.

After a lot of reflection over the past couple months, I am starting to think that I may be better suited for consulting or banking due to my long-term career aspirations and highly ambitious nature. The money and overall reward/effort ratio is a big factor for me as well.

If I wanted to pursue this path what do I need to do in order to position myself into a banking or consulting position? I don't think I would be taking much of a salary cut by applying myself for a graduate/ entry-level position. But the question is, would a company be willing to take me as a graduate with 2 years experience?

I've also been thinking of doing an MBA and then applying for post-MBA positions. But I am not in the position to afford a 200k program and no income.

Sorry for the long post, I really appreciate any input help from you guys! Thank you.