You know God was never invisible in the beginning, he walked around with people. Then soonish God became transparent, angels became transparent too.You are working from a faulty premise. God did not "make it so", man did.
I don't think you are writing from a necessarily Christian perspective, and I understand that. I can give you the "Christian" answer, maybe some others can provide other ideas.
From the Genesis account, man was originally created in full fellowship with God. We left Him, He did not leave us.
Sin has created a rift between God and man which resulted in death. Death properly understood is not cessation of being, it's separation. Physically, separation of the body and soul. Spiritually, separation from the presence of God.
What you want, I think, is for God to show up and say, "I'm back, and I'm not mad any more." I'd like that as well. It would be super cool. But it's not going to happen.
God did, in a sense, show up once and make Himself known. We hammered him to a tree.
God is harder to catch than a Pokemon.
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