Not much you can do but drive it easy. I would get a new trans from the dealership if it were me.
You can find them cheaper, but you get what you pay for.
And, Drift Ninja, if fluid is leaking from the front of the trans, it is the front trans seal, not the rear main. The rear main seal is part of the engine. If it was that, it will be more than $50 to fix because the trans needs to be removed. The trans is already slipping though, so most likely it needs to be replaced.