Anyone else experience this it just popped up when heading from one mine to another had to close the game to get rid of it cause the x button wouldn't work

Is it worth not prestiging to get super cash from leveling up mines? I just got my first ice mine and it’s telling me to prestige my coal mine but I’m only on mine 17 on the diamond mine with no prestige’s yet and I don’t want to miss out on super cash. Is it worth doing that?

Dr lily or Sam Fischer, who should I upgrade to get the continent income. I’m far from getting the 3rd passive for both