converting coordinates from none to ll84

Hello,

I just finished a project without using any coordinate system (it shows none), and now i need it to be in ll84 coordinate system. Is there a way to convert it? When i try to do it, the streets go to a random location (in a random longitude and latitude), and even if i move it to the right place it doesnt work, because the scale of the drawing doesnt seem to be right, and i cant manage to fix it. Any help is welcome.

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