I don't think anything drastic will happen, maybe just switch Aaltonen and Pesonen. Hytönen was bad, Immonen at least wins faceoffs and can pass the puck:
Jokinen-Barkov-Donskoi
Komarov-Kemppainen-Aaltonen
Pihlström-Immonen-Louhivaara
Pesonen-Kontiola-Ruutu
Enough time is enough time, and something needs to be done to that Kontiola unit. But what, that is the question.
In that lineup, I'd say swapping Donskoi and Aaltonen around could be a good move as well, because Aaltonen can do the same things Donskoi now does in it, and we'd get extra boost from the Kemppainen-Donskoi chemistry.
Jokinen-Barkov-Aaltonen
Komarov-Kemppainen-Donskoi
Pesonen-Kontiola-Ruutu
Pihlström-Immonen-Louhivaara
Though most realistically, I'd say most likely thing is to put Pesonen in that line instead of Ruutu, to put together that old familiar unit:
Pesonen-Kontiola-Aaltonen
Jokinen-Barkov-Donskoi
Louhivaara-Kemppainen-Ruutu
Pihlström-Immonen-Komarov
To fine-tune a bit more, you could also swap Donskoi and Ruutu around.
Perhaps my personal favorite would be however to build us a new 2nd line using Pesonen and Kemppainen, our two best forwards not in the Barkov unit as its base:
Jokinen-Barkov-Ruutu
Pesonen-Kemppainen-Donskoi
Komarov-Kontiola-Aaltonen
Pihlström-Immonen-Louhivaara
Additionally, swap Aaltonen and Ruutu around.