As a freelancer myself, you're paid to build the product and make sure the client is happy. It is their job to design the product and to find product market fit

As a freelancer myself, you're paid to build the product and make sure the client is happy. It is their job to design the product and to find product market fit. I have watched so many people shoot themselves in the face over things that I thought were dumb, but did it for them anyways because they asked. Yes, I know it sucks to have a portfolio of bad clients. Really the only thing you can do is fire the client and find someone that is easier to work with that has better potential for a successful project. 2 years seems like a long time to work with someone. I'd just look for a new client.