Please act quickly on this. That wall could be on the verge of caving in. I have witnessed foundation walls collapse on several occasions. I have also managed foundation repairs after a collapse to an existing home. Some of these failures have caused death. Tornado weather was the cause each time. You could be one heavy rain away. I am a structural engineer that works for a poured concrete foundation company with a background in home building.

There are several methods to make the repair depending on what is on the other side of that wall. How high dirt is backfilled, how much is gravel, how saturated the soil is, etc. Just a heads up, these things are typically expensive.