Your best source of ad copy is customer reviews.
It tells potential customers what to expect in their own words.
Not marketing or your industry jargon.
“Our T1000 dog treadmills are the best because of our T4478 technology we developed, you see it works likes this…. [Insert far to much detail you care about but 99% of customers don’t]”
If your reviews suck, focus on fixing the problem there before you pour more effort and money into ads.