Settling usually happens in the first year or two and repairs even ugly ones usually stay repaired unless there is more movement over time.
Footing depth compared to frost depth is a good thing to consider.
If the frost depth is 36" and your foundation is at 34", it may only freeze to that depth every few years and would only move things a bit.
The next could be clay soil under the foundation that swells and shrinks depending on moisture content.
So really the trick is to figure out why the house has moved and is it still moving .
Houses can be leveled from under it but that is pointless if the real problem is not solved.
I would do a detail drawing of the crawlspace or basement and set up a laser so it can be seen from most of the basement.
And measure from the laser line up to the subfloor ever 5 or 6 ft along the perimeter wall and the center walls if you have them.
Record all the readings on the plan.
Check that again when the ground is wet when ever your rainy season is. Any changes then would indicate a drainage and clay issue.
If it is a frost depth issue, sometimes you can raise the dirt level outside or bury insulation foam board under the dirt to give it more protection. You would check what the code is and try to figure what depth you have.
The detailed drawing with elevations would also be used if you were to jack it up and level it.
