What games?
Honestly unless your seeing performance issues, I'd just keep the cash and buy more games.
But you ou could go to a 5800x3d on the same mb/ram. It'd be a drop in cores, but depending on the games it could be beneficial.
Or upgrade cpu/ram/mb to the newest gen
I've sunk way too much money into my water cooling setup. It becomes a bit of an obsession.
Welcome to the water cooling club.