I am running Sonatype Nexus Maven Repo 3.41.1-01 i want to upgrade to Nexus 3.69.x-xx

I am running Sonatype Nexus Maven Repo 3.41.1-01 i want to upgrade to Nexus 3.69.x-xx without loosing my data and settings.
Current Directory
/opt/nexus3
/opt/sonatype-work

Can someone help me with details steps?