Thank you for sharing the steps you’ve already tried.
I just want to be upfront, Microsoft Support agents do not have direct access to accounts.
Before moving on to the steps, please try this suggestion from Microsoft:
The Microsoft Account Recovery is currently the only official way to recover your account. You can try it up to twice a day.
If it’s already been a few weeks, you can check this page: "Account recovery unsuccessful" https://support.microsoft.com/account-billing/account-recovery-unsuccessful-dc56c3e3-dff0-4ed5-8edb-60290eea6b53 it includes extra tips from Microsoft that could improve your chances.
If the form hasn’t worked after several attempts, you can try reaching out to Microsoft support directly.
Use another personal Microsoft account you currently have access to or one you can create:
- Here is the link: https://support.microsoft.com/home/contact
- Type this keyword and press Enter: Contact Support.
- At the bottom, click "Sign in to contact support" and sign in with your Personal Microsoft account (Not work or school account), or click "Contact Support" if you're already signed in.
- In Product and services, select "Windows".
- In Category, select "Technical support."
- Click "Chat with a support agent in your web browser".
I really hope this information is helpful!
Please know that this is a public forum, and I can only provide information.