No, because most games only have Nash Equilbria. Nash Equilibrium assumes that everyone is acting rationally, not just the person you are advising.

Some games, like second price auctions (under certain assumptions about people's values for the good, and knowledge of their own and other people's values) have so called dominant strategy equalibria. In this case, you can say how a person should act regardless of how others act.

But these scenarios are the exception rather than the rule.