Thank you for asking this question on the **Microsoft Q&A Platform. **
The easiest way to do it is option 3.
However, it will be more professional to create a tenant with your company name, if it is not too complex to recreate your infrastructure, do it.
If you are familiar with terraform, with Azure Terrafy you can export your resources configuration and recreate them in your new tenant
Here you can find some Microsoft Partners https://partner.microsoft.com/en-US/membership/cloud-solution-provider/find-a-provider
Hope this helps!
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