I got to live a life that was at the same time very full (mainly because of myself that wanted to see and do as many things as possible) as it was insightful, and it that regard, time flew by. The country is so big, and it has so much to offer that it’s hard to even prioritize places and activities. Even in your own neighborhood you can still discover new things every other day.
On another note, I truly believe it is an experience that opens doors, be it in Japan or in Europe – based on others’ stories and my observations. But at the same time, you have no obligation to enter them, and might as well just add the whole time spent in Japan as a wheel in the big cog machine of your life, personality, and skills, as it will undoubtedly stick in your memory for the rest of your days.