Hi guys, I'm unable to cover code for my trigger. As I'm new in coding I'm facing issues. Here unable to cover the code in bold format and I'm getting only 37% code coverage. Can you please suggest/give tips/code your ideas?. Thanks in Advance.

TRIGGER::
trigger Commission_Trigger on Commission__c (after insert, after update) {
    try{
        if(Trigger.isAfter && Trigger.isInsert && !CommissionHelper.isCommissionTgrAlreadyRunning){
            
            CommissionHelper.isCommissionTgrAlreadyRunning = true;
            set<id> accountids = new set<ID>();
            List<string> ruleIDs = new List<string>();
            map<id,account> existingaccountmap = new map<id,account>();
            
            List<ID> toDeleteCommission = new List<ID>();
            Map<string,Commission__c> triggerCommissionsMap = new Map<string,Commission__c> ();
            List<Commission__c> finalUpdate = new List<Commission__c>();
            
            for(Commission__c cm : Trigger.new){
                if(string.isNotBlank(cm.Rule_ID__c)&& (accountids <> NULL) ){
                    triggerCommissionsMap.put(cm.Rule_ID__c+cm.account__c,cm); 
                    ruleIDs.add(cm.Rule_ID__c);
                    accountids.add(cm.account__c);               
                }
            }
List<Commission__c> existingCommissions = [SELECT Id, Name__c, Sales__c, Status__c, Account__c, Description__c, Rule_ID__c FROM Commission__c where Rule_ID__c IN :ruleIDs and account__c IN :accountids and ID NOT IN :trigger.new limit 10000];

            for(Commission__c cm : existingCommissions){
            string keypoint = cm.Rule_ID__c+cm.account__c;
                Commission__c cmNew = triggerCommissionsMap.get(keypoint);
                if(cmNew != null && string.isNotBlank(cmNew.Rule_ID__c) && string.isNotBlank(cmNew.Account__c) && cmNew.Rule_ID__c.equals(cm.Rule_ID__c) && cmNew.Account__c.equals(cm.Account__c) ){

                    if(string.isNotBlank(cmNew.Rule_ID__c))cm.Rule_ID__c = cmNew.Rule_ID__c;
                    if(string.isNotBlank(cmNew.Name__c))cm.Name__c = cmNew.Name__c;
                    if((cmNew.Sales__c != null))cm.Sales__c = cmNew.Sales__c;
                    if(string.isNotBlank(cmNew.Status__c))cm.Status__c = cmNew.Status__c;
                    if(string.isNotBlank(cmNew.Description__c))cm.Description__c = cmNew.Description__c;

            finalUpdate.add(cm);                    
            todeleteCommission.add(cmNew.id);
              }
            }
            system.debug('The finalUpdate Info::'+finalUpdate);
            if(finalUpdate.size() > 0){
                system.Database.update(finalUpdate);
                CommissionHelper.toDeleteCommission(toDeleteCommission);    
            }
            
        }else{
            //Do nothing
            system.debug('This trigger logic is not executing 2nd time');
        }
    }catch(Exception ex){
        system.debug('Some thing went wrong::EX:'+ex);
    }
}
    
TEST CLASS:
@isTest
public class Commission_Trigger_Test {
    public static testMethod void testCommissiontrigger() {
               
        List<Account> act = new List<Account>{ new Account(
            Name = 'Jeffy',
            Brands = 'Appliances',
            Account_Manager__c = 'DougBolo') };
                  
        insert act;
                 
        List<Commission__c> comtr = new List<Commission_Meter__c>{ new Commission__c(
            Description__c = 'Books',
            Rule_ID__c = 'R5522',
            Sales__c = 122,
            Status__c = 145,
            Account__c = [SELECT id FROM Account LIMIT 1][0].id,
            Name__c = 'Active')};
                 
        insert comtr; 
        update comtr;
        
      List<Commission__c> updtcomtr = New List<Commission__c>{
            [SELECT Id, Name__c, Status__c, Account__c, Description__c, Sales__c, Description__c FROM Commission__c where id in :comtr]                for(Commission__c ucomtr:updtcomtr){               
                ucomtr.Name__c = 'zhan11';
               ucomtr.Status__c = 'Processing';
               ucomtr.Description__c = 'New Rule';
               ucomtr.Sales__c = 1000;                
               ucomtr.Rule_ID__c = 'Z443';                           
        }        
        update ucomtr;                
    }
}