Wa `alaykum As-Salamu wa Rahmatullahi wa Barakatuh
If you have broken you fast intentionally, then you ought to make it up as best as you can. If you cannot do so because of valid reasons, then you should expiate by feeding the poor. It is called the Fidyah. Fidyah entails feeding a poor person for every fast you have broken.
Furthermore, you also should repent and ask forgiveness of Allah and resolving in your mind never to do the same.
Almighty Allah knows best.
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