It's hard to say, I would hire a builder, that's what I am. Someone with local experience, some of these things can get pretty regional depending on where you are. Where I live there is a section of town built on an old landfill, so sometimes the foundation under all or part of the house sinks. You have to do detective work, look for cracks, we're those cracks repaired? Have the repairs re cracked? Maybe it stopped moving years ago. Just jacked up a friend's house that settled, groundwater collecting under part of the house, it sand a few inches, buy no signs of recent movement, cracks not growing more