How to update my current MacOs version if my macbook doesn't offer new updates?
How to update my Macbook Pro (17-Inch, Mid 2010) High Sierra 10.13.6 currently installed to MacOs Mojave or later?
MacBook Pro 17″, macOS 10.13
How to update my Macbook Pro (17-Inch, Mid 2010) High Sierra 10.13.6 currently installed to MacOs Mojave or later?
MacBook Pro 17″, macOS 10.13
Also, just so you know, what you were wanting to do is not an update. It is an upgrade. Totally different things and they are found and downloaded from different places. It's good to keep that in mind.
The last 17" MBP was discontinued in 2011. It can't run anything higher than 10.13 High Sierra.
You can't.
How to update my current MacOs version if my macbook doesn't offer new updates?