Can anyone that believes in YHVH prove that he exists? Has he ever spoken to you?
You ask this with the belief that communication is only achieved thru speech. But you know already that this isn't true in the physical world. In fact all of us here are communicating perfectly well without speech. Without making a single sound.
"The word of God is living" for a reason.
If you can accept that there is an aspect of reality that cannot be seen, heard, touched or even proven..which are our thoughts and emotions, which are the most real parts of ourselves, then it's not a stretch to believe in the existence of God.