When we are typing, we feel the speed of our hands going really fast. If you type really fast without that much effort, then that means that you can feel that you are going super fast and you are just calmed down and you are just typing and typing without even thinking much about it. But if you type a little slow, then you are like trying to get fast, and you are tensed out in trying to get the highest wpm possible. The best thing to do to get more fun while typing, would be just to type in your normal speed and normal accuracy and improve in that manner. In that way, you will have fun while typing, while you also improve. Just make sure you are not tensed out while typing. And surely do not look at the keyboard and type, in that way, you will also be tensed out and won't get the fun of typing. Have fun typing!