How does a startup with an MVP show customer validation with enterprise clients?

I have been working on a project with a very good friend of mine. We very recently completed our MVP and were looking to get some customer feedback/validation to find out if there is even an interest in our product in the industry. Our potential customers are mainly businesses and big ones at that. I was wondering what the best way to get some sort of proof of interest in our business will be? Thanks in advance.