I have spent countless hours thinking about personal motivation and enthusiasm and how big role they play in individual improvement.
When you are enthusiastic about something you are at an excellent position to absorb as much new knowledge about that subject as possible. Use this opportunity and improve yourself.
Try to take conscious steps to get the most out of your enthusiasm. If you are interested in a new programming language, buy a book or participate in a FOSS project. Start to code a simple application with the new language.
The point is that you are extremely open to new ideas and knowledge when you are enthusiastic. Take advantage of it!
This way you can set a new status quo for yourself and start the improvement cycle that leads to continuous improvement. There is no end in sight for learning new things.