YOU SAID:

I would like to go on a long run alone

INTO JAPANESE

私は一人で長い目で見たいと思います

BACK INTO ENGLISH

I'd like to take a long look at it by myself.

INTO JAPANESE

私は一人でそれを長い目で見たいと思います。

BACK INTO ENGLISH

I'd like to see it in the long future by myself.

INTO JAPANESE

長い将来、自分で見たいと思います。

BACK INTO ENGLISH

I want to see it for myself in the long future.

INTO JAPANESE

私は長い将来自分のためにそれを見たいです。

BACK INTO ENGLISH

I want to see it for myself in the long future.