Have you tried any other strategic board games out there? There are a fair few relatively recent games that involve deep strategy that come to mind. Since board games require the players to enforce the rules of the game themselves, there's an intrinsic limit to how complicated the game can be before it becomes tedious.

Terra Mystica and Caylus are two examples that I would mention as having a decent amount of complexity and are deeply strategic games without being too complicated. However, whilst still being considered as strategy games, the mechanics and methods of thinking are very different to those used in Go, so it's difficult to compare them directly.

They also have very little randomness in them, so the players' decisions are much more impactful.