1. Public should not have access to a phone number of a person posting a task, only a registered service provider should ne able to contact them, this is 2023 and internet not safe anymore.

2 should provide some way of checking id of an individual who signs up as a tasker/ service provider

Taskrabbit, airtasker and the likes all do these basic steps for customer safety and security.

4. Public should not be able to contact any one unless registered, maybe this is prevented with membership?

5. Maybe ask us (your customers who use your product) for input on a good template and design one that will stand out.