To convert to the full Standard edition, you can use the DISM (Deployment Image Servicing and Management) command-line tool without reinstalling the operating system . Quick Checklist Before You Start
Converting a Windows Server 2016 Evaluation edition to a full Standard version is a common task for administrators who have built test environments and want to transition them to production without a full reinstallation. This process is officially supported by Microsoft using the tool. Critical Pre-Check & Limitations windows server 2016 evaluation to standard