Having a great profile and pictures are the secret sauce to getting bookings. Looking at your profile, well your pictures aren't very good nor appealing to potential clients. No one really likes selfies with a smoosh face!!
Drop-ins and walks are the least booked services and depending on your location may not be a service the client base wants.
You need to take and pass the Rover 101 quiz, it is important
You say you have a flexible schedule but having all your weekends blocked is a sure way not to attract clients
One testimonial isn't enough so you need to ask friends and family to help
You have set your service area too large it actually hurts you in showing up in searches, consider making it a few miles smaller.
The biggest thing I noticed in your about me section is you are planning to go to graduate school - well congrats - but stating that doesn't give me a feeling you will be around long to care for my pups.
Sorry for being so critical but you have some work to do - best of luck