A business without a network is not even a business. Even if your network is just one person to sell your time to do manual labour that is still proof of a network.
While there are many ways to grow your business often the simplest way is to just do more of the thing that you are doing for more people. The issue being how to build your network in order to reach more of them. From social media to the in person networking that is so simple to referrals and recommendations building networks has so so many advantages.
As with many ways to grow a business the more you do it in person almost always the higher the conversion, the less the cost and the greater the impact.