how to pass username in html email template in django using msg.send()

I am new to Django coding. I am currently working on DRF Django Rest Framework along with API. I have been trying to send a HTML email template with attachment as soon as the user register . I have achieved sending the same but i want to pass the dynamic contents like email of the user registered to the HTML email template from views.py , But unable to do it. I am using msg.send().

IN VIEWS.PY:

def attachment(request):
   queryset = User.objects.all()
   em=[]
   h=[]
   for star in queryset.iterator():
       em.append(star.email)
   print(em)    
   h=em[-1]
   msg = mail.EmailMultiAlternatives(
        subject = 'attachment',
        body = 'Hi, Welcome!',
        from_email = 'anushstella97@gmail.com',
        to = [h],
        connection = con
        )
   msg.attach_file('C:/Users/hp/Downloads/APIV1-master/APIV1- 
     master/polls/img.jpg')
   msg_html = render_to_string('C:/Users/hp/Anaconda3/Lib/site- 
  packages/allauth/templates/account/email/email_confirmation_message.html' 
  , {"email": request.user.email})

   msg.send()
   return HttpResponse('<h1>Created</h1>')

IN HTML TEMPLATE:

<p>Thanks for signing up! We're excited to have you as an early user.</p>
                <p> Your registered email is : </p>
                <p>
                    <strong> {{ email }} </strong></p>

To render the template you can use render_to_string from from django.template.loader and pass the context variables along with it..

E.g.

from django.template.loader import render_to_string
html = render_to_string("account/email/email_confirmation_message.html", {"email": request.user.email})

Inside email_confirmation_message.html:

Hi {{ email }},
...