Is that theme available ?

simply, I’m looking for theme fulfill my below requirements.
1- Platform for more than 1000 car dealers can register and manage their own selling operations on the platform.
2-unlimited users create their accounts and begin to buy their new vehicles.
3-The possibility of Sales Force CRM integration
4- Payment method Visa-Master
5-Inventory management system
6-Peer to peer Used car selling service.
please let me know if you can support me urgently

You won’t find all that off the shelf.

If you have a sensible budget (tens of thousands $) and time frame then you could look for a freelancer on

Don’t forget you will be looking at some serious security, hosting, maintenance costs each month to run a site like that