Seirawan Chess, Euroshogi, Fischer Random/chess960 (or chess18) or Crazyhouse are other ways to make chess more interesting or less predictable.

In this video Fischer briefly and enthusiastically talks about this topic. He talks about Fischer Random and he suggests the Capablanca proposal might be even better, and there can be even more creative variants. https://www.youtube.com/watch?v=vb7-0R2qg98

I like Seirawan Chess and Euroshogi a lot, next to King of the Hill and other games like Minishogi, Tak, Tzaar and RftG.