It's tough for Westbrook to regain momentum while there are lots of criticizing him because of his poor plays. He should take that as an inspiration to work hard more. I know he's trying his best but it's just that, he's not the same as before.
I'm sure his teammates are giving him some good words of advice on how to deal with lots of negative reviews. LeBron lives on that since then but still making good production so I'm sure Westbrook can also be like that. Not with the points, not with the rebounds, not with the assists, and so on but on how to blend properly with his teammates regardless of who's on the floor.
They just have to make sure to get on the play-in to fight for the playoffs spot while waiting for Anthony Davis to return in action.