if you got a GTX 1060 6GB or better you really have no reason to upgrade.
if you want amazing graphics that is higher than 1080p then you might want a 1070 or better.
a GTX 1050 (imo) I would avoid as they won't keep up in the coming future.
the 1050ti I wouldn't recommend unless it was a laptop and you won't be getting amazing graphics either.
