I made a promise to Allah ﷻ by saying "i will keep till i die" and i broke the promise after a month as the intention of "i will not continue this promise" it was for a sin i am trying to control. Should I make Kaffarah only one time or the promise is not broken?

Ustadh AbdulAziz al-Haqqan

If it was an oath by Allah then breaking it obliges repentance and one kaffarat yamin, and if it was only a promise or a covenant without swearing, then no kaffarah is due on it and only repentance.