Yourself.
Not the economy, not society, not traffic, not the weather, not the government, not your negative relatives, not any circumstances. Just you.
But here’s the simple answer: you would be hard pressed to change what is outside of you, but it is perfectly in your power to change what is within you.
In the end, it is a good thing that you are the key to your better future, because you can change. And when you change, everything changes for you.
That’s it.