Hello /p/, a total noob here.

I recently bought a used first generation E-M5 plus the 12-50mm kit lens. This also my first camera. Together with them I also bought two extra Olympus Zuiko lenses: 14-42mm and 40-150mm.

Yes, you read that right. Zuiko. Not M.Zuiko. I made a huge blunder making an impulse purchase.

Now the question is, should I trade those two extra lenses and add some cash for a Sigma 19mm f2.8 EX DN or should I get a Four Thirds to M43 converter?

What should I do, /p/? What's the best course that I should take in order to minimise my losses?

Thanks a lot in advance. I'm looking forward to your responses.