Patience is the key as for many it takes time to acquire clients, a lot depends on where you live and how much penetration Rover has made in the area. I see you live near Manchester NH, and that is a mid-size city so there is a good probability of owners looking for pet care services. However, when I searched your area for walkers I found quite a few but most had only a few reviews, that tell me Rover hasn't yet caught on that much yet.
What can you do? I would change out your background picture as a fuzzy sun in trees is not that appealing, and also add more pictures of dogs, you with dogs, and more dogs. I would look to join local area Facebook groups that will allow you to post your services and availability. Go old school and post tear-off flyers on local bulletin boards in libraries, Starbucks, pet stores, vets and more.
Don't get discouraged and hang in there, it took me 3 months to get my first client, but ever since I've been busy