Saying that Season 4 of Deep Space Nine was a "relaunch" is a wild and absurd overstatement.
Yes, it introduced Worf and yes it reintroduced the Klingons as enemies. Certainly those ideas were meant to draw in new viewers, no argument.
"Way of the Warrior" was obviously a big, splashy two part premiere which launched a (limited) Klingon war and brought Worf into the fold.
But, come on, to say that the show shifted directions is just patently untrue. Yes, Bajoran politics had been largely dropped after Season 2 for the most part and yes, this was in response to studio notes. They felt those stories weren't particularly compelling so the producers mostly moved on from them, except when it came to Emissary-centric stories or keeping Winn in the fold as a recurring villain.
But look at the episode list for Season 4. What do you see? More of the same. Ferengi episodes, Maquis episodes, episodes about Dukat and/or the Cardassians, a sprinkling of sci-fi of course, and a lot of attention paid to the rising tensions with the Dominion. The Klingon War becomes nothing more than more background noise and there isn't a single episode or A-story that focuses on it exclusively, unless we count "Return to Grace" (which is really about Dukat) and "Rules of Engagement", by which time the war had already trickled into a kind of stalemate. The Klingon War only becomes a major component of an episode one more time in "Nor the Battle to the Strong" before it's quietly put away in "By Inferno's Light."
The writers admit that the Klingon War got them off track from the Dominion story somewhat, but really, look at Season 4. That season's major moments have nothing to do with the war and Worf really doesn't do much of significance that year at all after WotW. Ramping up tensions with the Dominion was always the plan, it was never any kind of course correction the writers happened upon in Season 4 (just look at Season 3!)
As for "Dastardly Dukat" episodes....I'm hard pressed to think of what you could possibly be talking about. Fortunately, it was very easy to move away from a non-existent trend.