Please share your store URL & Screenshot, So I will give you proper solution here !
Hope you're doing good. I saw your website. I would suggest keep the ad t cart button just below the quantity as it is currently. It's looking good below the quantity as your text says In my pocket.
If you keep next to quantity option in mobile it will need to be smaller as the text is big as compared to add to cart
Surely can you give me staff access of your theme so I can do the same.
You can send me access of your store. Staff access.
Got the access Thanks
we can communicate on my email