Hi Lei,
Thank you for posting your question here, let me help you regarding your concern.
You can change the email address associated with your Microsoft account by adding your personal email as a new sign in alias and then making it the primary one. Sign in to account.microsoft.com go to Your info then select Manage how you sign in add your personal email and complete the verification. Once verified set the personal email as the primary alias and confirm you can sign in successfully. After that you can safely remove the work email. Also, is the work email a corporate Microsoft 365 account or just an email used to sign up personally?
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Best Regards,
Angelique P.