Hi wonderful Community

I need help with a test class for a trigger, only at 47% !!

Here is the Trigger

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Trigger CreatingAutoRecords on Opportunity (After Insert, After Update)
{
    
    List<MRR__c> MRRRecordsFinalListToInsert = New List<MRR__c>();
    
    If(Trigger.IsInsert || Trigger.IsUpdate)
    {
        For(Opportunity opp : Trigger.New)
        {
            If(Opportunity.Contract_Period_Months__c != null)
            {
                List<MRR__c> fetchingAlreadyExixtsedRecords = [Select Id FROM MRR__c WHERE Opportunity__c =:opp.Id];
                
                If(fetchingAlreadyExixtsedRecords.IsEmpty())
                {
                    // We are only creating a records when there is no MRR__c records exixts.
                    For(Integer I = 1; I <= opp.Contract_Period_Months__c;I++)
                    
                        {
                        MRR__c crd = New MRR__c();
                        
                        crd.Opportunity__c = opp.Id;
                        crd.Name       = 'Month' + I;
                        crd.MRR_Amount__c = opp.MRR_Amount__c;
                        crd.MRR_Date__c = opp.Contract_Start_Date__c.addMonths(I);
                        
                        MRRRecordsFinalListToInsert.add(crd);
                    }
                }
                
            }
            
            try{
                If(!MRRRecordsFinalListToInsert.IsEmpty()){
                    insert MRRRecordsFinalListToInsert;
                }
            }
            Catch(Exception e){
                System.debug('The thrown exception for CreatingAutoRecords is:: ' + e.getMessage());
            }
        }
    }
    
    
}

And this is the Test Class

@isTest
private with sharing class CreatingAutoRecordsTest {

static testMethod void MyTestCreatingAutoRecords()
{
test.starttest(); 

    
    List<MRR__c> MRRRecordsFinalListToInsert = New List<MRR__c>();
    
    
    
    
      
   MRR__c crd = New MRR__c();
    crd.Opportunity__c =  '0062C00000AVFEwQAP';
    crd.Name = 'Testing';
    
    crd.MRR_Amount__c = 110;   
    
      MRRRecordsFinalListToInsert.add(crd);
                        
                        
     insert MRRRecordsFinalListToInsert;
    
    
    
    
    
     Database.SaveResult str = database.insert(crd , False);

        System.assertEquals(True, str.isSuccess());
     
   test.stoptest();  
    

}
}


Any help would he highly appreciated to get it to pass at least