A Motivational Equation

Remember this:
Motivation times ability equals performance.

M + A = P

So, if your motivation is high and your ability is high, then your performance will be high as well. If you are performing at a low level, be sure to check your motivation and your ability.

If you are lacking in either and had to choose between motivation and ability, I would choose motivation. With motivation, you can increase ability.

In essence, you should concentrate on improving ability and sustaining motivation.