Despite not being supported by Samsung anymore and having no more software updates the hardware is still in good condition because I took care of the device. I think the push to always buy a new device is problematic. Some people take care of their phones and don't always want or need the latest phone but it would be nice to continue to have some kind of software support.

You have not tried to install an updated custom ROM to the latest version, for example Lineage OS has support for the vast majority of Samsung