Was the porch poured with the home or an after thought? So, the porch is not tied into the homes foundation or slab?
To answer your question directly, NO, there is not a compound or levelor that will do what you want it to do with that severe of a "fall".
Everything I think of would be topical and would only be temporary.
I am almost leaning to jackhammering it up and begin again the right way or method.
Lets here others comments.
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