One thing that helped keep my 2015 viable is upgrading to a bigger and faster NVMe SSD. There are cheap adapters that let you install an M.2 drive. There are so

One thing that helped keep my 2015 viable is upgrading to a bigger and faster NVMe SSD. There are cheap adapters that let you install an M.2 drive. There are some pre-reqs and not all drives work but I've had zero issues with mine.