Whenerver New Quote signed via DocuSign to changeEnvelope status Completed stage in opportunity to close won and to send email of the quote to user@gmail.com

Trigger

trigger CreateQuoteDocSignComp12 on dsfs__DocuSign_Status__c(after insert,after update){
List<Messaging.SingleEmailMessage> sendMails = new List<Messaging.SingleEmailMessage>();
List<Messaging.EmailFileAttachment> attachmentList = new List<Messaging.EmailFileAttachment>();
  set<Id> docusignID = new set<Id>();
   for(dsfs__DocuSign_Status__c dsfs : trigger.new){
         if(dsfs.dsfs__Envelope_Status__c == 'Completed'){
            docusignID.add(dsfs.ID);
            }
      }
      system.debug('@@@@@@@@@@@@'+docusignID);
      user currentUserID = [select id,email from user where id=:userinfo.getuserid()];
      list<string> UserEmail = new list<string>();
      UserEmail.add(currentUserID.Email);
   
      list<string> email = new list<string>();
      email.add(currentUserID.email);
       system.debug('#######################'+email);
   
      for( Attachment att : [ Select Id, Parentid, Body, Name from attachment where parentid IN: docusignID ]) {
      system.debug('22222222222222'+att);
      system.debug('888888888888'+email);
      Messaging.EmailFileAttachment efa = new Messaging.EmailFileAttachment();
      efa.setFileName(att.Name);
      efa.setBody(att.body);
      efa.setInline(false);
      attachmentList.add(efa);
   
      Messaging.SingleEmailMessage singleMail = new Messaging.SingleEmailMessage();
      singleMail.setToAddresses(email);
      singleMail.setTargetObjectId(currentUserID.ID);
      singleMail.setSaveAsActivity(false);
      singleMail.setTreatTargetObjectAsRecipient(false);
      singleMail.setPlainTextBody('Your Email has been sent');
      singleMail.setFileAttachments(attachmentList);
      sendMails.add(singleMail);
      }

      //Messaging.sendEmail(sendMails);
     }