These comments offer great insight.
I would add that motivation is grounded in your priorities. Once you identify what's important to you, you need to be willing to make sacrifices.
Remind yourself that life's trials and errors help uncover great opportunities. Even if the results you get from making efforts aren't those you initially intended, your mindset will enable you to experience unexpected benefits.
"All growth is a leap in the dark, a spontaneous, unpremeditated act without benefit of experience.” -Henry Miller