What is the ruling on one who broke his fast on days of Ramadan and does not know the number of those days

The questioner : This questioner, S.R. from al-Qassim, says in this question that he is a young man of twenty-three years. He says that in the past of his life, he was negligent in performing the prayer and even fasting. Months of Ramadan passed during which he broke his fast on days without a valid religious excuse, merely out of negligence; whenever he felt hunger or thirst, he would break his fast. After Allah granted him repentance and he realized the seriousness of this matter, he became consistent in prayer. But what pains him, Honorable Shaykh, are the days that have passed of the blessed month of Ramadan and the days of fasting that he broke. How can he clear his conscience of them? He notes that he was unable to determine the exact number of those days on which he broke his fast. Please guide us, may Allah reward you.

The Shaykh : Regarding the days you broke your fast: the questioner, you used to break your fast after you had intended to fast and made the commitment, but you would break it during the day due to thirst or hunger. It is obligatory for you to make up these days, because by committing to them, you became like one who vowed them. As for if you did not fast at all, the stronger opinion is that you do not have to make them up, because making them up would not benefit you in this case. Yes.
And the saying of the Prophet (peace and blessings be upon him and his family) , and on this basis, you must seek forgiveness from Allah the Exalted for what you did and increase in righteous deeds, so that perhaps Allah the Exalted will erase your bad deeds with them, for , may Allah bless you.
If you do not know what you missed, act on certainty. If you are in doubt whether you invalidated the standing of three days or four, the default is that you did not invalidate more than three, because the fourth is doubtful, and the default is that the conscience is clear.

The presenter : May Allah reward you with good, Honorable Shaykh.