Stop pests eating my brassicas

Hi
This year catipillers ate my brocolli bare , didn't touch sprouts as much , I want to so brassicias next year such as kale and sprouts, I don't want to net the plot as there is a cat that wanders in would wreak it , is there any easy alternativea to stop the dreaded catipiller such as conpanion planting etc ? First year growing then this year live middle of knowwhere where knowbody grows veg and they still found my plot lol

 

I think there are various biological controls for caterpillars.
Just one of a few types https://tamarorganics.co.uk/product/caterpillar-control

 

Consider the use of scaffold debris mesh, its cat and builder proof. This year its snails that are my number one problem , little tiny ones.

 

I'd be more concerned with snagging birds rather than cats when using netting.