You say that nothing has changed by following the advice.
There is only one person that you can change and that is YOU.
There is nothing wrong with praying for your wife and your marriage but I can tell you that the tighter you squeeze on a bar of soap the harder it is to hold on to it.
Your wife is that soap. Let it go and let it dry out.
Much later it will be easier to hold on to but not right now.
You are getting great advice, if you want to have any chance at all of reuniting, let go and turn to your faith that you will be provided for.
Keep reading here and maybe it will start to sink in.