As somebody that does business development, I really don't want to intrude on people but at the same time I need to generate leads. What other tips do you have

As somebody that does business development, I really don't want to intrude on people but at the same time I need to generate leads. What other tips do you have for someone like me? (I'm pre-sales for a vendor that sells products and projects around 1 - 10 million$) for a large vendor.