The bottom line is that you have to ask a posaik whether shovelling (within an eiruv) is allowed.
He MAY tell you that if you truly felt it was a sakana to walk on the unshoveled area, you should have not gone to shul.
If you didn’t feel it was a sakana until AFTER you fell, maybe the homeowner didn’t feel it was a sakana either, and can’t be blamed any more than you for the choice you made to walk there.