Worf will go into Star Trek: Picard still plagued by the events of the Dominion War.
When Star Trek: Deep Space Nine brought in the Dominion War arc of the series, it rose the level of expectations fans had for the show week in and week out. It reset the standard for Trek storytelling. It was fantastic, but despite the enormity of the situation, the one thing we can save safely is that the after-effects of the war were not a major element in future Star Trek shows.
Lower Decks, Prodigy, Picard, and Discovery (after season two) all took place after the events of Deep Space Nine and the Dominion War, but despite the gravity of the event, the aftermath has been minimal. There really hasn’t been anything to showcase how devastating the war was after it was over.
As a matter of fact, the lone time Deep Space Nine was revisited after the war, everyone was jovial and having fun. So we really haven’t seen anyone truly affected by the war. Until now.
Worf will deal with the issues of the Dominion War in Star Trek: Picard
While we don’t have many details, Picard executive producer Terry Matalas has revealed that Worf will e plagued by the events of the Dominion War to some degree. Saying that Worf has never quite truly moved on from the war makes total sense for the character too. Worf, as much as anyone, if not more so, was affected by the Dominion War in profound ways.
He was tortured, beaten, and had to deal with the death of his wife, Jadzia Dax. Though that kind of hurt hit differently, as part of Jadzia came back in the form of Ezri Dax, the next holder of the Dax symbiote. So he had to not only lose his wife but get dumped by the symbiote’s new host.
So it makes total sense that Worf would not be over the events of the war and why we see him as a pacifist in the new trailers.