Individual — 4g network

I am happy with Airtel when I ported from reliance few year back expecting much from you I continued with 4G sim card but I feel I made mistake I could select other network for the browser I residing in Karnataka mysuru where I get poor Network. I was in Telangana where I was not getting proper network present for few days I am in jharkand jamshedpur being a well built city here too very poor Network I am very sad about you. Could you please give suggestions what shall I do to get good coverage.