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Your hero does not have to achieve their goal, but (IMO) for a YA novel, they must achieve something of note. Luke Skywalker did not kill Vader (in the first movie) but destroyed the Death Star and...
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Source: https://writers.stackexchange.com/a/34196 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#3: Attribution notice added
Source: https://writers.stackexchange.com/a/34196 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
Your hero does not have to achieve their goal, but (IMO) for a YA novel, they must achieve **_something_** of note. Luke Skywalker did not kill Vader (in the first movie) but destroyed the Death Star and defeated Vader's plan, this was a major setback and victory for the rebels. Killing one antagonist in a vast government conspiracy does not seem to me a satisfying ending. I also do not think (again, just my opinion) you should plan on a trilogy with this strategy, unless you are going to write all three books before you try to get published. Publisher's won't commit to a book with a poor ending, with nothing but a hope you will write the sequels in a few years, so your poor first attempt will finally sell something. If you are a new author, every book must sell on its own as a complete story. The publisher _hopes_ you can take advantage of your fanbase (and expand it) with each new sequel for a decade. That is built-in cheap marketing and cheap profits for them. I buy books on a whim all the time, probably thirty a year, and I'll try a new author if the first page reads well. I'd buy a trilogy. But I would not buy the first book of a trilogy from a new author, unless all three books were published. I think something significant and life-changing must be accomplished by the hero, or I don't like the book, and wouldn't buy a sequel. If they do not win the war, they must win the battle at hand and kick the villain(s) in the metaphorical face. You didn't stop the mob like you wanted to, but you sure made an epic kill of the kingpin in your town. You didn't reform corruption in government, but Nixon was forced to resign in shame. **_And your hero survives and their battle continues._** That is the epilogue to the first book, and allows the next book, which your publisher will be happy to pick up if the first one sells.