俺だったら

if I were you

→ 俺
phrase Rare #30,699
if I were you Informal and masculine due to 俺. Often used to give advice by imagining what one would do in someone else's situation; it can also mean “if it were me” or refer to one's past self depending on context.
JA: 俺だったら、そんな仕事は断るけどな。
EN: If I were you, I’d turn down that job.

俺だったら違う行動を取るけど

If it were me, I'd do things differently.

俺だったら彼の忠告に従うけどなあ

If I were you, I'd take his advice.

昔の俺だったらミド好きになっただろうか

Would the old me have fallen for Mido?

— オールド・ボーイ (2003)

俺だったら天狗になっちゃう

If it were me, I’d get pretty full of myself.

俺だったらトム忠告に従うけどなあ

If I were you, I’d follow Tom’s advice.