The communication circle is limited and the connections are not wide. You'd better use some promotion on the official website SEO, Weibo, various blogs and communities, and B2B platform promotion. You should also make a few good content blog posts and stories and let them go. Touch and impress your customers. After a year and a half, there will be many accurate prospective customers to add you.
Being passively added by customers like this is perfect for you.
At the same time, write the content of your circle of friends well, not only a little taste, but also people have a sense of trust. Every day, I write some content carefully, and send out 10 micro-posts of various content every day for a long time. Those prospective customers who add you from the Internet will actively communicate with you through private messages and change from prospective customers to customers.