Which demat account to close ?(Zerodha ir Groww)

I have two demat account Zerodha and Groww I use groww platform to invest in mutual funds I don't trade anywhere but i have some stocks in zerodha (which i am thinking of selling) When i opened zerodha i found out they had charged AMC costs to my demat account. After talking with support i came to know if your account is not BSDA then they charge AMC quaterly or annually. (Since i have 2 demat accounts, my account is not BSDA) My invested amount is too low and I can't afford to pay 300 charge annually am not even making that much in profit. So I'm thinking of closing one demat account. I have read that zerodha has zero equity delivery free which is a big advantage if we trade a lot. But I'm not thinking of trading in the near future mayb i will buy and hold on stocks Which demat account should i close? The mutual fund that I'm investing in is available at lower SIP on groww so I have to invest through groww only. So if i close groww demat account, will i still be able to invest in mutual funds ?