Idea would be to be of two things.
Manager in sense of that deck building is the way to make the game have some strategy, instead of being completely random.
Second part is the "push your luck" idea. As in, you turn those card randomly, and it should feel like that more cards you turn, riskier it gets. Therefore making you think if it is really worth the risk to turn one more card or not.
But that Push your luck part isnt working. I mean, isnt working in sense that you would feel like that when you are playing. I do notice that when I playtest myself, that I do sometimes stop turning more cards for a strategic reason, but what I would like it to feel is that every time you turn one more card, it feels like the risk is getting higher, and that I dont feel happening righ tnow.
That to compare to 21, you are aiming at getting 21, and each card gets you closer to that goal, but everytime you turn a card, it also feels riskier to turn the next one, and yet at same time there is the incentive to turn one more card, so you could get closer to that 21. That is basically what I am trying to get this game to achieve, but it just isnt happening.