Motion activated sprinklers.
Try planting lavender in with them.
” plant” plastic forks, tines up, where they like to go.
Mogie is right, motion activated sprinklers, they do not like to be wet.
This is the only thing that has ever worked for me: https://thehoneycombhome.com/how-to-keep-cats-out-of-the-garden-without-hurting-them/
we use peoria exterminator