If "ruined" refers to damage or destruction:
* Restored: This implies bringing something back to its original state or even improving it.
* Repaired: This means fixing something that has been damaged.
* Saved: This suggests preventing something from being ruined.
* Preserved: This implies keeping something in good condition, preventing deterioration.
If "ruined" refers to a failed plan or situation:
* Successful: This means the plan or situation has been completed with a favorable outcome.
* Thriving: This suggests that something is flourishing and prosperous.
* Improved: This means the situation has become better than it was before.
* Saved: This means the situation has been rescued from failure.
If "ruined" refers to a negative impact on someone's reputation:
* Rehabilitated: This means someone has restored their reputation after a period of decline.
* Exonerated: This means someone has been cleared of wrongdoing.
* Celebrated: This means someone has received praise and recognition for their achievements.
The most appropriate opposite will depend on the specific meaning of "ruined" in the context you are considering.