This is your validation. It is telling you that, for now, big companies are not your target market.

Your initial target market should be people that you can reach. For example, if you can get small businesses to talk to you, then make them your target market, and validate ideas to serve them.

If you really want to work with big companies, then still follow this advice and find another target market (such as small businesses). Once you have success with SOME target market, you can use your existing customers (who know and trust you) to refer you to buyers in your preferred market (big companies). Also, remember that people change jobs. A customer who works at a small company can go to work for a large company.