Question

我相信我会越来越优秀，直至你后悔当初的决定翻译成英语

Answer 1

I believe that I will get better and better to the point that you will regret about the decision you made earlier. 或
I have confidence in myself that I will get so much better that will make you regret about making that earlier decision.

Answer 2

I believe I will more and more good, until you regret the decision.

Answer 3

我相信我会越来越优秀，直至你后悔当初的决定
I believe I will be more and more excellent, until you regretted the decision。

Answer 4

i believe i'm going to be better and better, then u would regret the decision u made.