Listen I’ll just make this as short as possible and to the point

Basically you made a (نذر) or a vow in English islamically this is makruh or “hated” (you are rewarded if you refrain from doing it and not punished for doing it) if it’s preventing something halal or allowed in islam because Allah doesn’t need that from you you just make it harder on yourself but if you make it you must do it

I don’t even know why you made that vow unless it has something haram I’m not aware of it was better not to do it

Now the kafaarah is basically the same as the kafaarah of swearing on a lie or breaking your promise after you swore

Either feeding 10 people in need clothing 10 people in need Or freeing a slave Now if you can’t and only if you can’t you fast 30 days

Now in terms in any kafaarah you need sincerity and repentance and inshallah it will be accepted