Recent article from wikiHow I sent to my son because he has a similar problem with moles in his backyard. Good luck.
We have used the pepper spray mentioned in the beginning of this articles for moles and it deterred them: https://chemistrycachet.com/how-to-deter-animals-from-flower-beds/
Replace it with large sharp stones.
Try tilling in some cayenne pepper, hot pepper seeds, black pepper, garlic juice...
Plant strong smelling flowers like marigolds.
Get sonic plug ins to repel critters.
Try this: https://www.craftylittlegnome.com/get-rid-moles-dawn-soap/