.if i (be)..... you,i (start).... think about your future career right now before it's too late

If I were you, I would start to think about your future career right now before it's too late.

Перевод:

На вашем месте я бы начал думать о вашей будущей карьере прямо сейчас, пока не стало слишком поздно.