[Python] Email verification in django python

I try to make email verification in django, everyting works correctly, but if user creates account with someone other's email and if user will not confirm email, owner of this email will not be able to register because account is alredy registered and is_active is False. Here my views.py with reg form '''

from django.shortcuts import render, redirect
from django.http.request import HttpRequest
from django.http import JsonResponse
from .forms import UserRegisterForm, UserLoginForm
from .models import User
from .tokens import accound_activate_token

from django.contrib.sites.shortcuts import get_current_site
from django.template.loader import render_to_string
from django.utils.http import urlsafe_base64_decode, urlsafe_base64_encode
from django.utils.encoding import force_bytes, force_str

from django.core.mail import send_mail

# from django.contrib.auth.forms import AuthenticationForm
from django.contrib.auth import authenticate, login, logout

def send_email_validation(request: HttpRequest, user: User, form: UserRegisterForm):
current_site = get_current_site(request)
mail_subject = "Activate your account"
message = render_to_string(
"users/emails/email_activation.html",
{
"user": user,
"domain": current_site.domain,
"uid": urlsafe_base64_encode(force_bytes(user.pk)),
'token': accound_activate_token.make_token(user)

}
)
from_email = "xxx"
to_email = form.cleaned_data["email"]
send_mail(
mail_subject, message, from_email,
[to_email]
)

def register_page(request: HttpRequest):
if request.method == "GET":
reg_form = UserRegisterForm()

if request.method == "POST":
reg_form = UserRegisterForm(request.POST)
# create user and redirect to login
if reg_form.is_valid():
user: User = reg_form.save(commit=False)
user.is_active = False
user.save()

# sending email for validation
send_email_validation(request, user, reg_form)

return redirect("users_login")
context = {
"form": reg_form
}

return render(request, "users/register.html", context)

def activate_email(reqest: HttpRequest, uidb64, token):
try:
uid = force_str(urlsafe_base64_decode(uidb64))
user = User.objects.get(pk=uid)

except (TypeError, ValueError, OverflowError, User.DoesNotExist):
user = None

if user and accound_activate_token.check_token(user, token):
user.is_active = True
user.save()
return redirect("main_page")


'''

tokens.py '''

from django.contrib.auth.tokens import PasswordResetTokenGenerator

class AccoundActivationTokenGenerator(PasswordResetTokenGenerator):
def _make_hash_value(self, user, timestamp):
return f"{user.pk}{timestamp}{user.is_active}"

accound_activate_token = AccoundActivationTokenGenerator()


'''

I think I need to save user only after email verified successfully, but I don't know if it will be correct

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