You are describing the hedonic treadmill. Essentially, you become used to your surroundings, and while they are objectively great, from the perspective of inside your own head, this is now normal and you / your monkey mind wants more. There have been a lot of post floating around the internet with various solutions, the most popular being Stoicism > Positive Psychology / Happiness research > Buddhism / Meditation. I'…
I think you drastically over-estimate how "fulfilling" something like therapy is. Day in and day out you will see people you desperately wish to help, who if they listened to 20% of what you offered would see their lives change immensely, only to watch them repeat the same behavior without change day in and day out. Worse, if you deal with depressed or addicted people it's just a matter of time before a client kills…
I've been trying to find games that are personal to the developer (I'm actually trying to make one now). What's the name of your game?