Sorry you are struggling as well, but it's nice to know we are not alone. When we first started potty training, when it seemed like it wasn't working, we took a break and backed off. But at this point, with him turning five in a few months, I feel like I need to keep pushing, but nothing I try seems to work.
I know, logically, at some point he will get it. It just doesn't feel that way right now.