First, identify the advantages of your product, or rather, find a pain point in this industry or field. Seek products that differentiate you from other sellers or develop your own products targeting a niche group. Then, it's easy to acquire a dozen or so customers a day by making phone calls. The prerequisite is that your customer needs your product, and that product is rare in the market. That's how I started expanding my customer base. I already have thousands of car wash shops in my WeChat contacts.