If you spend your money on something, you will want to use it. For example, if you buy an expensive tennis racket, you will probably go out and play tennis every day.
This rule is also true for learning English. If you want to increase your desire to learn English, buy a new dictionary, an interesting English-language book, English-language cable TV, etc. The idea is simple: You paid for it, so you will want to use it, and you will improve your English.
There is a problem with this method. It only works for a short time. You usually lose your desire to learn English after a few days. To keep learning, you would have to buy something every week!
However, this method is helpful, because it gives you an impulse to start learning. For example, if you buy a dictionary of phrasal verbs, you will probably learn some words from it. Then you should try to use them. For example, write an e-mail message with these words. This will increase your motivation (as explained before), and you will learn more.