Suggestions to acquire new clients for agency offering Food Aggregator (Zomato, Swiggy, ONDC) management services

We’re an agency offering end to end management of food aggregator services. We are 4 years old, currently manage ~100 outlets, primarily in Delhi-NCR. Our clients are mid size, mostly multi-outlet brands. We’ve started expanding in Bangalore, what could be some ways of acquire new clients here. We currently rely on cold-calling, door to door visits, and referrals. We have been scaling our digital marketing recently. Any suggestion with regards to that is also appreciated. Even any brands which could use our services could be helpful. In the past we have been able to get max results for sweets+multi-cuisine outlets, but are open to others too.