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I've previously used NTPassword Reset to gain access to the local admin account at http://pogostick.net/~pnh/ntpasswd. I recommend burning the bootable media or creating a USB drive and booting from it. Follow the provided steps—it's straightforward with helpful guides available. After unlocking the local admin account, you should be able to log in and attempt PC repairs. This method works on Windows versions up to 8.1, though I'm not sure about Windows 10 (assuming NT 6 compatibility). Using this disk will reset the password, but you'll lose any decryption certificates for other accounts if needed. Feel free to ask if you need further clarification. Good luck!
You're stuck at the login screen with only one account. You've tried the Ethernet cable but have an extra PC available. It might help disabling Safe Mode before logging in, which could allow internet access for updating your Microsoft account password and restoring normal login. Thank you for reaching out for assistance!