https://youtu.be/8DPlsTbOReM?si=O9K9Y8mVZ24XClzO

I used to make camera move so far with low FOV to get the effect, but is it properly to make camera view as Orthorgraphic ?

Orthographic is not fully supported by the engine, so it's not officially available.
Please use LOW FOV.
For isometric effect I like to stick with 25 Degrees FOV for my own games.