I kept at it (OR stuck

Question

At first, I could speak only a few words of French. I kept at it (OR stuck with it OR refused to give up), however, and after some hard work, I was finally able to speak with some fluency

Answer 1

اینا به ذهنم رسید: همینطور ادامه دادم/ چسبیدم بهش/ ولش نکردم/ پا پس نکشیدم/ پی‌اَش (پِیِش)‌رو‌ گرفتم