Google does not come to our site!

[golgoe]

in March, Google came to our site everyday and our site was indexed by Google.. Google sent to us so much visitors..
We was earning money by selling our products!

Now we are not!
Because Google does not come anymore!

We did not do any cheat!
What can be happen?

Now Google does not came since March FOR 1 TIME!

PR is 4..
I tried to add link of our site to our other sites!

I have still nothing!

What Can I DO?

there was/is no hidden text
there was/is no fake content