You can't just keep going on a journey to search for motivation, because it didn't work for me. If you've attempted to read the productivity literature and the self help literature, I'm sure everything I say, you know already.
So to keep it clean and simple, pull yourself together man. No one is going to help you, and you're on your journey on your own. The motivation has to come within, and if you really want to become successful, then start acting more successful. Surround yourself with people of good work ethics. Start challenging people to motivate yourself through competition. You have to figure out what works for you.
The best way to measure your determination is to go jog. Set a high expectation number, let's say if you're endurance can only allow you to jog 2 miles currently, set a goal to jog for 4 miles. Refuse to stop until you finish the distance.