Hero MP, Vilain CO

* HOLE CARDS *
Dealt to Hero [8h 7h]
Hero: raises €1 to €1.50
Vilain: calls €1.50

* FLOP * [Kc 5s Th]
Hero: bets €2.32
Vilain: calls €2.32

* TURN * [Kc 5s Th] [Ah]
Hero: bets €5.50
Vilain: calls €5.50

* RIVER * [Kc 5s Th Ah] [Ad]

My question is should we bet this river as a bluff, obviously in a GTO way we should have some bluff here, but most of his bluffcatchers have a great blocker, an ace, so he will be always calling with his bluffcatch, then should we ever bluffbet here ?
Thanks a lot