It would seem that difficult, “to offer service” – took and wrote the announcement.
Written. There are few or no calls. Try reading your ad on behalf of Your customer first.
Who’s Your client? Who exactly do You offer your services to?
Imagine his image –
What does he want? What tasks does he want to solve? What problems does he want to get rid of?
What knowledge does he have about what You do?
What value do You offer him? Why does the client need Your service?
Answer these questions in your ad and there will be more feedback.