Motivation can't be given. It's a unique, deep, personal thing. The best motivational speakers out there like Tony Robbins often specialize in sparking the fuel inside you.
To quote a chapter from Alter Ego, Todd Herman, there are commonly 4 sources: Trauma, Destiny, Altruism, Self-expression.
Trauma is the Batman route. Someone hurt you deeply. You want to prove an ex wrong. A teacher didn't believe in you. Part of my motivation is corruption. I have a relative who's hardcore poor. People would give donations to her, but when the religious authorities pass her the envelopes, a little would be missing. They digitised the distribution of cash and the corruption stopped. I've been digitising a lot of third world bureaucracy since.
Destiny can be if you're in the right circumstances. Both my parents went to Harvard, in a country where it's very rare for people to have a decent education. My dad was a startup guy before the word startup was even common. So I feel it's wasteful to not be doing something ambitious. Or some people feel that the responsibility just fell on their shoulders.
Altruism can be the will to see your community improve. You might be say, the eldest in a family of people who work hard labor, with a parent who worked their ass off to pay for your education. Or go deeper, maybe you had a grandparent who migrated and worked two jobs so that your father could become the doctor. Maybe you are the one who wants a better life for your grandchildren. Maybe you're a minority who wants to give inspiration to others.
And then self-expression, where you feel the urge to experiment and build. Why do people climb mountains? A lot of techies start here; many made games or something as a kid and somehow landed in an office job.
Tap into yourself to find that inner motivation. The Five Whys are a good place to start. Why do you want to work out? Why be healthy? Why live longer? Why are you where you are?
There's a well of emotion deep inside you somewhere. Striking it will bring the tears out. You have a good idea where the well is. You'll normally dig around it; it carries a lot of weight, responsibility, and it limits your options. This is probably a good time to tap into it, though.