Cannot update the version

If you have an iPhone 6S, that is expected. Otherwise, please post back with relevant details as to what happens when you attempt to update.

Check this Apple Support document for iPhone that Qualify to run iOS 17

Refer below link

iPhone models compatible with iOS 17

Explore the Apple Trade-In  Process where the Value of the exiting device could be used against the cost of a new Apple Computer, iPhone or iPad 

Notation - Some devices and depending on their age may have little to no value at Trade In time.

But at least the device will not arrive to the Land Fill Site and be recycled in a responsible way by Apple