I picked up Phoenix Point because I was feeling that XCOM itch and knew if it wasn't this I would start a Long War game of XCOM2 which would probably take 2 years to finish if I did at all.
Far Cry 5 is $6 and though I'm not particularly tempted I've heard good things.
Mad Max is $2 and if you haven't played it I would say it most certainly a bargain at that price. It is fairly boilerplate open world where you take towers and bases to gather resources for upgrades and eventually unlock tougher and tougher zones. The vehicle combat is really the standout and your car is the star of the show. Just tearing around the desert is fun in itself. Taking caravans is particularly cinematic and satisfying to eventually bag one that you just weren't quite able to before your latest upgrade. Unfortunately the base assault and dismounted fighting is pretty forgettable with batman arkham-style auto-target with quicktime blocking that doesn't change very much as you unlock new abilities. My 2nd favorite open world game after shadow of mordor/war.
I would suggest using GG Deals which shows multiple storefronts. Not all of them are trustworthy though.
And for me I bought Guild Wars 1 which is actually cheapest on Steam at a historical low. I also picked up Deadly Premonition 2 and Alice Madness Returns which are also on historical lows.
I usually go with Isthereanydeal to comb for discounts across multiple storefronts. Its shown me some that look like they'd be iffy, but all of them have checked out fine with no risk factors or nonsense.
GMG is just my solid choice for consistently discounted newer stuff. Because anything cheaper than what they are offering is usually a scam. And since I've had an account for so long I already qualify for all their "Gold XP" deals, which is usually an additional discount on everything.