Question Making Peach Wine

[huanghong]

My Dad is making peach wine and it is almost ready to bottle. We tried it today and it is a little bitter and dry. Is there any way to make it sweeter now or is it too late. It has been sitting for three months. Can we add sugar at this point and if so does it need to sit longer. We did add sugar when making it but I don't think we added enough.