you don't know what you got...
You don't know what you got 'til it's gone is a common refrain.
The statement usually implies that we are undervaluing whatever we "got" and thus, we need to value whatever we have more.
Equally valid though, is that we are overvaluing whatever we "got" and thus, we need to value whatever we have less. In other words, sometimes we don't realize the cell we are living in, until the walls are gone. Or sometimes, we say things like, I didn't think life could ever be like this, only after it's gone.
Either way, "it's gone" is the important part. So, get away from it.
Gain a new perspective, a new view, a new angle, and you'll probably a) live a more grateful life with what you have and b) a more free life by breaking down some walls that need to be smashed.