So this is a fun challenge. For these suggestions I'm going to follow a few rules for myself: The overall plot beats need to be the same. Major characters cannot be removed. All major arcs need to happen. That said...
1a) INTRODUCE SPHENE EARLIER. This may be a weird thing to start with, but considering that she was meant to be a twist villain, and her bond with Wuk Lamat was meant to "pay off" in Queen Eternal (you know what scene I'm talking about), Sphene's relationships with us really needed to stew for a time. A lot of the elements that fall flat in the second half really suffer from not enough to from things to process and build up to an impactful moment. It's the less spoken issue with DT's pacing that's seriously damning. Sphene being present earlier could also help explore the same thing about Wuk Lamat's love of peace in a show not tell way, its virtues and its faults, rather than regurgitating the same plot point again.
1b) For God's sake, flesh out Zoraal Ja. The guy comes off as written by an edgy teenager with how much he shits on past foes and has cryptic, twisted views on peace, but it didn't need to be that way. All that really separates really bad writing here from actually interesting writing is some goddamn context. Why does he feel this way? What happened to lead him down this path? Real, satisfying answers, not just a half baked at the last minute identity crisis that doesn't answer half the questions, and none of them in a satisfying way. DT wrote him like the friggin' Jailer. Good writing could have stopped that.
Hell, pairing us with him instead of Koana for the taco making competition could have been a good way to do this, rather than having the black and white "good guy team, bad guy team".
1c) More emphasis on Krile's legacy. Similar to point A. Krile has a very impactful plot reveal for her character, but a large part of the impact is lost because there's so little setup or attention paid to Krile in favor of yet another revelation that Wuk Lamat likes peace.
