Thanks!@Carsten Alex is dead right this is a massively difficult thing to develop. There are a lot of lessons in building a platform that lists cars, that may steer you in a new path. Most customer facing applications in auto are really just a variant of a listing site bundled with a specific focus.
It seems you have a skeleton, now try to find a way to get customers to interact with it. Think about getting a narrow customer audience and focus on understanding how to serve them.
I'm stuck in the chicken and egg situation at the moment. Once I get a few dealers willing to list with me, I can spin up the marketing for buyers.
I'm not using some script I bought off a site. It's totally built up from scratch and all bespoke code. Yes, it has taken longer than expected but it also has evolved into a platform centered around revenue generation and bringing in foot traffic. You are very right about the lessons learned.
I also agree that serving the customer what they want and can use is really the key.