I don't think sending constant pressure is the answer but disguising looks, dropping guys out and bringing guys from different angles will be key. For as good as Herbert has been so far, he's still young and the best way to get a young guy off his game is to throw a bunch of different looks at him.
I would crowd the LOS from time to time as well. Basically, do everything under the sun to leave Herbert guessing as to which 4 are coming at him.
Chargers QB Justin Herbert on Ravens defense: "It was a lot of looks that we didn’t see on film and stuff they constructed for us. They did a great job at disguising their looks, bringing pressure from one way and hiding from another. It was looks they hadn’t shown all season."