Getting clarity on short term professional objectives

Your goal should be to get a position with a financial firm that will allow you to put your education into practice and give you tangible experience so you can advance in this chosen path or go off and start your own firm. I would hesitate talking about starting your own firm as this is far off (IMO, you don't have enough experience to provide value for at least a decade, if not longer).

Right now, with your experience, you are trying to get an analyst role at a bank (investment banking, credit analyst, research associate, etc.). Your education will provide you with the understanding necessary to be successful in these entry level roles where you will incorporate academic knowledge along with real world applications.

The goal with these essays is to show that you have some form of understanding and plan on how you are going to use this education to get a job. These schools want employed graduates. Something about a job and a paycheck that improves reviews of the program. Keep the essay focused on the short term and if you want you can include long term ideas towards the end.