When I was 13 I had a hypothetical discussion with classmates on what it would look like if you controlled the world.
We learned throughout history many civilizations have fallen, not because of war but because of how divided the people were. Sparta fell because of feminism. Rome fell because of immigrants, and so on.
So we had a hypothetical discussion on how to take over the current year.
All you have to do is start proxy wars in the middle east which will flood other countries with refugees. Refugees who will eventually out breed the native population.
Control every major media outlet. Spread lies and misinformation to divide the people. This tactic alone is the sole reason BLM was created in the first place because the media kept over exaggerating black deaths until people started to get enraged.
Control every popular magazine, tv show, movie, etc. This will inspire people to be more "different" to be more queer, trans, etc. People that will follow your agenda with the content you are producing.
You add all of these together and eventually a society will start to collapse. This has happened all throughout history because you don't collapse a civilization through war, you collapse them by dividing the people.