Troublemaking Demon God

I used to be a Holy Emperor, enlightening all the people, until I met a Demon God.

I used to be the Heavenly Emperor, ruling over a realm, until I met a Demon God.

I used to be a demigod, powerful enough to blot out the sky with one hand, until I met a Demon God.

I used to be a lesser god, lord of the continent, until I met a Demon God.

I used to be a Demon God. I'd beaten up everyone above me, until an arrow hit my knee and, through a twist of fate, I ended up ten thousand years in the future, with all my cultivation gone. At least I'm still alive.

You ask how I'm doing now?

"This Demon God is about to cause some trouble today!"