How to keep enthusiasm and interesting?

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maybe most people have the same feeling as below: we have many favorites before; we are ambitions before; we have good dreams before; we are enthusiasm before; but accompany with you are older, your work experience enhence... you found that all are changed... you are so easy feel boring... have no interesting for anything, although most of project make your crazy before... you are often to answer" just so so"... ...... do you have the above symbol...you know, enthusiasm and interesting is so important for all of us... then how to keep enthusiasm and interesting... please comment, thanks...