How Reset Variable After Loop

Hi, i have a custom class with a variable(rate) and this variable change after time, I want my variable back to default after my code looping

     public class Wave
     {
         public float rate;
     }
public class SpawnerPool : MonoBehaviour
{
     public Wave[] waves;
     public int nextWave;
     
    
  
    void WaveCompleted()
     {
         waveCountdown = timeBetweenWaves;
 
         if (nextWave + 1 > waves.Length - 1)
         {                
             nextWave = 0;         
             ShowTextAnimation4();
            // Reset Class Variable 
         }
         
         else
         {
             nextWave++;
         }
     }   
     
     IEnumerator SpawnWave(Wave _wave)
     {
         
          
         // Spawn
         for (int i = 0; i < _wave.count; i++)
         {
           if(SpawnGo)
           {
             if(_wave.enemyindex == 1)
             {
               SpawnEnemy(PoolObjectType.Enemy);
             }
             
             if(_wave.enemyindex == 2)
             {
                SpawnEnemy(PoolObjectType.Enemy2);
             }
             
             if(_wave.enemyindex == 3)
             {
                SpawnEnemy2(PoolObjectType.Enemy3);
             }

             if(_wave.enemyindex == 4)
             {
                SpawnEnemy(PoolObjectType.Enemy2);
             }
              yield return new WaitForSeconds(_wave.rate);

             if(_wave.name == "wave1")
             {
                if(nextDrop >= 7)
                {
                  if(_wave.rate > 0.3f)
                  _wave.rate -=  0.07f;
                }
             }
             if(_wave.name == "wave2")
             {
                  if(_wave.rate > 1f)
                  _wave.rate -=  0.04f;
             }

           }
  
         } 

 
         yield break;
     }

Instead of adjusting the rate, you could keep 2 variables on the wave instead and only adjust the other variable based on the rate?