He already did.
He gave you Quran. Prophet says if you want Allah talk to you, read Quran. Sure it is not possible to see him by eyes, but you can see him in every single thing around you.
Just think about your self, and all the complicated parts you have in your body.
Think about your tiny kidney, which works 24 hours to clean your body, while you are doing other things. How big machine you will need to do it's job, while you are tied to that machine not able to do any activity for hours.
Do not you see him in this small part?
How it existed with so sophisticated job?