Q.Copper leaf plants
Our copper leaf plants are being eaten. There are holes in the middle of leaves as well as along the edges. We know we have snails and slugs, and we’re putting out beer traps for them. We don’t think the leaf damage has been caused by them, however. Please help if you can!

You could have slug and other chewing pests. Continue with the beer traps but spray your plants with Neem Oil.
Neem Oil is organic and safe for people, pets and bees.
Here is a link with more information.
https://www.gardeningknowhow.com/plant-problems/pests/pesticides/neem-oil-uses.htm
https://www.gardeningknowhow.com/plant-problems/pests/insects/kill-garden-slugs.htm