Most adults try to fix friends or family at some point — their bad relationships, career mistakes, harmful habits. The pattern rarely produces change and consistently damages relationships. Most people don't change because someone wanted them to; the fix project becomes the problem.
What to do instead
Listen without solving. Share concerns once, clearly, without pressure. Then accept the person's decisions even when they're wrong. Maintain limits on your own behaviour (you can decline to lend money, attend certain events, enable certain patterns).
When it's appropriate to intervene more actively
Safety threats (suicide risk, domestic violence). Children at risk. Active addiction crisis. Otherwise, the person's life is their life.
Saving energy from fix-projects redirects to your own life — which is the only one you can change.