We can start from nuking the first line, as it loses its 5v5 matchups, and replacing guys with the Chibs and Chazes. Then, we continue with somehow convincing Heinola to not leave for Europe and give him 20 minutes a night in perpetuity - you'd know that as the Pionk treatment. Finally, abolish the Lowry line, start running three offensive lines like Dallas does, distribute the 5v5 minutes evenly between the three, and promote prospects as needed.
Dallas has roughly done all of that, going from a Benn/Seguin/Radulov-driven core to a much wider one featuring a lot of young talent that performs with good consistency. They also didn't get afraid of promoting Harley when Heiskanen had health issues last year - we would never do that with Morrissey and Heinola. And if your answer to this is again "but their prospects are better", read this line from above:
Our most highly trusted, overpaid and overplayed roster players have been shit. What's the harm in replacing them with other shit?