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It's almost the antithesis of "practice makes perfect" — you remain average, but the peak rises; so you are always getting better but never approaching best.
Hahaha. That's pretty close. Now that I think about it, this reminds me of video games that are set so that the more skilled you become at the game, the more difficult the game becomes.
Snowballing best conveys the cumulative effect of my situation. I just realized this question had been closed as a duplicate, and I'd like to note that this answer demonstrates why the question is not a duplicate: It does not ask for the word that describes something harder than it looks; rather, it asks for the word that describes something that grows more difficult with time. Consider the example given in the "duplicate": painting a room. While perhaps harder than it looks, it becomes easier with time.
