I've used LineageOS to revive a Samsung Galaxy S4 and a Note 3, they work pretty well. The installation is easy. That said, you might encounter bugs on your particular device which may or may not be a big deal for you.
I have had some issues with GPS accuracy and Bluetooth connections from the S4 to a certain device occasionally dropping out, but I haven't done careful before/after tests so these may be hardware problems. I would recommend giving the LineageOS a try, at least before replacing the phone, if that's the path you want to take.
I have had some issues with GPS accuracy and Bluetooth connections from the S4 to a certain device occasionally dropping out, but I haven't done careful before/after tests so these may be hardware problems. I would recommend giving the LineageOS a try, at least before replacing the phone, if that's the path you want to take.