What should I do about making up for the past Ramadan fast before the coming Ramadan, knowing that I broke the fast for the entire month after childbirth and can only fast with extreme difficulty, and I have only made up four days so far?

If a breastfeeding woman breaks her fast fearing only for herself, or for herself and her child, she is only required to make up the fast (qada'). If she breaks her fast fearing only for her infant, she must make up the fast (qada') and offer expiation (kaffarah (definition)), which is feeding one poor person for each day. The makeup fasts must be performed before the next Ramadan (definition). If the excuse persists until the next Ramadan, she should fast that Ramadan and then make up the days she missed.