Average is his arc. but that's not a bad thing since average can win a team lots of games. It's very hard to become average.
Ryan is average but when the Falcons put pieces around him he becomes near elite. That will help Goff the same way.
But the biggest improvement will be Goff figuring it out on his own. He's played QB for years, he's faced problems before and overcame them to get this far. He has to take that step again.
Fans buy in the myth of QB whisperers, there is no such thing. All the coaching in the world doesn't matter in the less of a 10th of a second the throw don't throw decision is made.