My current MC in VoraCity is finally starting to come to terms with her individual power being far greater than anyone she's met si far, but at the same time, she's just one person in an era where populations were ballooning by the tens of millions every year. At this time, there's nothing she can do to affect the fate of the world or any other lofty goals. Even overthrowing the wicked institutions ruling over the city-state she lives in, would be nothing more than a wishful, distant dream. It's a setting that likes to cut down the tall poppies, so to speak.
So, for right now...
1.) What is meaning "peace" to your protagonist?
Peace is getting to curl up in a warm room at the end of the day, without worrying about anything collapsing in the near future.
2.) Who are worth protecting?
Only the very few closest to her. She has disgust for the oppressions of society at large, especially with slavery, but she doesn't see much she can do. As a non-human, she can only see it as "this is what humans do to each other by nature". It makes the bitter pill taste only worse to swallow.
3.) Who are threats/enemies?
Anyone putting her closest companions or herself at risk, along with the estate she belongs to. More broadly, the human society around her as a whole. Not in a vague "society bad" sense, but rather she has had it hammered in that if the government learned of her existence, she would almost certainly end up captured and experimented on for the rest of her life. It leaves a lingering dread that she's in the wrong for the sin of merely existing as a nun-human.
4.) How does your protagonist achieve peace?
Hedonistic indulgence, a very short-term, narrow-minded approach. At the end of the day, she really would be the type who only loves to party and chill out with any friends or interesting strangers around. It might sounds vapid, but there's an innocence to it. The tragedy of it is that she'd be right at home in a silly slice-of-life setting, but instead she's mired in a world of cutthroats and cruelty. Watching her happiness be denied is sad, but at the same time, it's frustrating watching how she keeps wanting to pull the wool over her eyes, pretending everything is going to be alright. You almost want to shout at her to get a grip and face the reality before her eyes. Then you get exactly that, and I hope it hurts seeing her becoming that kind of person.