Shreya, your freelance work can add the diversity factor to your Academic profile. Please add it under your work experience. Most IIMs or Top B Schools for that matter consider work experience atleast that of 2 years before they can consider you as a fresher. So if you have 1 year freelancing work and  5 months of full time experience as of now, by the time admissions start rolling, you will put up another couple of months. That will be close to 2 years. So, any experience that you have gained over the years adds to your advantage and so we would suggest you not to let that go.