Coin sip vs AMC sip expense ratio

If I do amc sip and normal sip of same fund will I have to give expense ratio twice?
I have amc sip going on in one fund but I want to increase the amount which is not possible. So I’m thinking to start normal sip in the same fund. Is there a better way of doing this? Or should I keep on “buy more” every month in amc sip?