Remove father's name from birth certificate

I am 25 years old and a proud single-mother to a beautiful boy.I had given birth at a hospital in shillong Meghalaya. I was in a very bad space mentally.I froze when they asked me the father's name because I was not married to my baby's father. It was during all the chaos in the pandemic. Hospital rules were different. I had no one that I know with me and I've even forgotten to get my phone. So when they asked me the father's name I just gave his first initial and surname. I was ashamed and felt awkward to tell the hospital staff I wasn't married and that I was gonna be a single mother. So now after 4 years I'm realizing things and know things that I didn't know back then. I thought it was mandatory to fill up the father's name.They told me it was mandatory. Now I need to remove the father's name from my kids birth certificate. I need to know how and what are the steps needed to be done and the documents that I'm gonna need and also how much fees should I expect to pay because I'd have to arrange all of that first. Please help me