言ってもらえなかったら直せなかったからありがとうって英語でなんて言うの？

ご質問ありがとうございます。

"I could not have fixed it"＝「私はそれを直すこおとはできなかった、」

"if you had not told me,"＝「もしあなたが私にそれを言わなかったら、」

"so thank you."＝「だから、ありがとう。」

☆他にも同じパターンの例文です：
"He could not have bought a house, if I had not worked hard for many years."＝「私が何年も頑張って働いていなければ、彼は家を買えなかった。」

ご参考に。

"言ってもらえなかったら直せなかったからありがとう"
- If you hadn't said anything I wouldn't have been able to fix it, thank you.
- Thanks for saying something. I wouldn't have known to fix it otherwise.
- If you didn't point it out to me, I wouldn't realize it was something I had to work on, thanks.