I cannot update my MacOS 10.13.6
The MacOS version I have is 10.13.6 and I can't update it to the latest release
MacBook Pro 13″, macOS 10.13
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Depending on the vintage or hardware build year version, your
Mac could see an upgrade to later macOS; if there's no smaller
step updates. Without knowing more about your specific Mac..
• How to get old versions of macOS - Apple Support
https://support.apple.com/en-us/HT211683
This article covers older and newer macOS versions; & tells of
what could work for most hardware within guidelines of age.