Why are we going away from the running attack?

We’ve been bad at blocking inside runs all year. Doesn’t help that even when teams expect pass they’re blitzing anyway so the line is always overwhelmed. This is where the quick pass plays worked in the past, but, well you’ve seen us play so far. It’s just ain’t working consistently.
I noticed that we don't do too much of that. What do you call it blitzing? What's that?