First of all, I highly suggest you seek representation. It is very difficult for people in your position to navigate the court process successfully, and there is so much at stake for you. That said, you will have to be able to show the judge that you can properly care for your child now. It sounds like you don't have that much of a track record yet, which the judge may want to see. The judge may continue the guardianship for a certain number of months, with some sort of transitional agreement in place to give you the opportunity to show that you can handle caring for your child, such as giving you visitation, overnight visits, etc. There are many possible outcomes at this next hearing, though, so it's impossible to give you all the scenarios here. Good luck.
I agree with Attorney Paquette. There is too much at stake here to leave it to chance. I would strongly encourage you to retain an attorney to assist you. Michigan law is slanted in favor of the parents, but that is no guarantee you will prevail. You should have help in framing your best arguments.
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If you cannot afford it there are some pro bono services, including Legal Services of Western Michigan that may be able to help. Offices like mine often give free consultation and agree to a simple payment plan to jump into these types of issues as well. You should have an attorney with you.