アドバイスがなかったら

if there had been no advice

→ アドバイス
phrase Rare #37,347
if there had been no advice A conditional phrase meaning “without advice” or “if there had been no advice.” It is often followed by a result such as 失敗していたでしょう, meaning “would have failed.”
JA: あなたのアドバイスがなかったら、どうしていたかわかりません。
EN: I don't know what I would have done without your advice.

お前のアドバイスがなかったら失敗してたよ

I would’ve failed without your advice.

もしアドバイスがなかったら失敗していたでしょう

If it weren't for your advice, I would have failed.