I know The Ark: Survival Evolved for some time.
Based on the screenshots and the videos, the game is beatiful and very interesting.
The $17.49 USD (65% off) price is also tempting, but I currently don't have a good enough computer to run it.
I will probably not have a good enough computer in the near future either.
There are other good games with great discounts (see this post for example), but I think that I have to pass any Steam discount this year (2019).
I also have to pass most of the free-to play games, because my old laptop (Toshiba Satellite A110-110) would not run most of them.