I would spend the Fall and early winter months developing a promotional program and getting into the community this winter to promote yourself. Local groups, advisory boards, church, family are your best place to start. 50 is very aggressive out of the box. But with you pounding the pavement during the fall and winter, picking up 20 shouldn't be too difficult. One of the methods that has worked well for us over the years is working with landscape design/build firms that don't provide maintenance. Go introduce yourself and see if they would be willing to use you as a referral when they complete a new landscape.