getting into Investment Banking way forward

Hello Everyone I am a recent graduate of Manchester Business School with a Master in finance i was unable to secure a position during my studies and was forced to return to Greece where i work in the transaction advisory department of an accountancy firm mainly performing due diligence. i would like to get into investment banking and give my lack of success so far i would like to ask about my options going forward. should i pursue the CFA, should I try for an MBA in a couple of years and which schools should i be hoping to get into ? Any advice would be very welcome. i am afraid i have lost my chance as i am currently 25