I started brainstorming Petrichor in 2016 and it was kind of a "what if worst case scenario" about what little I understood of the political climate at the time, and I kind of got into worldbuilding that and doing some research into science advancement and political history to feed the world.
I didn't realise how extreme Trump would be at the time, nor how bad brexit would be, and France narrowly avoided electing the far-right at the elections the following year, but it did get me thinking. In 2017 I predicted a climate crisis (in part to justify the characters having a similar obsession with the beauty of water to me), a deadly pandemic starting in China due to population density, lockdowns that contain it, excessive oligarchy, governments being run by proxy by the rich and not elected officials, Russia and the US becoming nuclear wastelands, nuclear war in Qatar, famine, and finally violent bloody revolution. So far I'm glad that I wasn't entirely right.
There's also big themes about characters in found families, finding your identity as an immigrant, and the duelling desire between desire to live peacefully even if that means accepting oppression, and wanting revolution to be free of fear despite that meaning that it's going to be a hard, long, violent fight that is unlikely to be won in your lifetime.
So... Yeah. It's sci-fi so it's basically a philosophical pamphlet but with pretty colours and neon lights.