Active Directory forest, root domain controller died

I have the following active directory structure:

       +------+ Forest +------+
       |                      |
       |                      |
       v                      v
domain1.example.com  domain2.example.com
     (root)                   +

       +                      |
       |                      |
       |                      |
       v                      v
      DC1                    DC2
  (WinSrv2003)           (WinSrv2008R2)

DC1 died a long time ago without any backup and was the only domain controller for Domain1.example.com

I think we transferred all of the FSMO roles to DC2 before DC1 died

All of the company users & computers are on domain2.example.com

I tried to add a new domain controller for domain2.example.com, but as its OS is Windows Server 2019, I receive an error saying that the forest functional level is Windows 2000.

I would like to have a clean active directory structure (with replication DC etc..) to avoid this kind of mess in the future, what is the best way to proceed?

All is currently working and I would like to avoid re-creating all user accounts if possible.

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