Time : the root currency

The only currency we have is time, spend it wisely on what you value.
Life is like a theme park where you have entered for a specific time, similar to a day pass in a theme park. How you spend time in this theme park is you choice. You can keep stressing out on score you make / keep cribbing that the game is unfair and still keep playing same game / or play multiple games, take it easy and just have fun in that park/ sit next to your coplayers in one game..

Anything and everything that you do in such a theme park is taking away some time - which is limited - it’s just a day pass. 

You can be spending an hour in a queue (studies, Uni) to ride a big roller coaster or start playing small games.
Everything you earn, $, gold, property, .. are like score in a game in that theme park. You will leave them behind when you leave the park. And you have to leave this park for sure. So no point of just getting fixated on the score and forgetting the experience. Make friends, spend time with your coplayers, enjoy the view, take a look at the entire theme park - may be the game you have been playing is not as enjoyable as the one on other side of park.
And incase making a high score (earning) in one game is the only thing what makes you happy -go for it. But just because you are scoring well in one game, that should not prevent you from leaving that game and explore other games. 

Avoid physically dangerous rides that can cause accidents, you want to maximise the time you have here.  

The objective of entering a theme park is to be happy. Same true for your purpose of your time on earth. 

Spend this currency (Time) on achieving the end objective-happiness.

Just do what makes you happy.