Install 2 steel piers beneath the footing to lift and stabilize it.

Depending on where you are located, it should cost between $2 and $4 thousand dollars.

It’s not a diy fix but it works.

And don’t believe the guy that said the whole hill is subsiding. That’s possible, but it’s far more likely to simply be settlement.

Read on line reviews and hire the right company. A good foundation repair contractor should be able to do this in a day.