I know fascism is unsustainable and will collapse itself

Historically speaking, authoritarian governments and absolute monarchy are absolutely sustainable. If anything, democracy and the protection of minority rights is a temporary blip.

For all we know, Trump could be the founder of a dynasty that lasts hundreds of years.

At the moment, China also seems to be out-competing democracies. Arguably technologies like AI, facial recognition, and the like will also help keep to authoritarian leaders in power.