website design - How to present users with multiple service options?

We currently have a marketplace that allows users to create a project, enter specs and service providers fulfill the service.

We want to show a new option on our website which is to provide a concierge service to users. We will be in charge of reviewing & improving the project specs, choosing service providers and coordinating the logistics.

• What would be the best way to inform the user that there is the 'concierge' service?



• Should this be done before the user enters the project creation funnel?


• Would a new button on the homepage/landing page saying 'premium service' that redirects users to information about the service be enough?


• What other alternatives should we consider?

edit Setting up the concierge service would be done after having a phone call with us. Besides informing the user about the concierge service, if the user decides to proceed, we will need to ask for their contact info. There needs to be some interaction between and the user to provide a high quality concierge service.