How do I downgrade my account from business with 3 licenses to individual plan?

It's only me. I don't need multiple licences. 

I don't need a large plan.  But I have been following convoluted instructions for ages and still can't seem to figure out how to get my plan to 1 user only, and I am way overpaying, since I do not use the 3 licenses.  I have been trying to figure this out for months, and can't get a solution!
Does anyone have any idea how to downgrade my account??? 3T will be plenty for me.

Thank you for your help!!