There are three main new business strategies for agencies to create new business opportunities. As you are a service business you will sell on trust and capability. Rarely one or other. I would recommend a rounded approach to include all of the following networking, speaking, event/webinar, social selling strategic partnerships, fame through awards/pr and driving referrals from existing clients combined with an inbound content strategy. There is no one quick fix all approach to agency lead generation, don’t let anyone tell you there is! Good luck!