Thirty Thousand Years of Chaos Across Nine Dynasties

Nine Dynasties means nine times.

Nine Dynasties means the final years of nine dynasties.

Built on an alternate-history setting, the story begins with the Great Yuan Empire and reincarnates backward through time, with the dynastic timeline stretched tenfold to roughly thirty thousand years.

Inner energy is introduced, people practice martial arts and seek immortality, martial arts become universal, and emperors and nobles wield power over all under heaven.

Some characters live ten times longer as their strength increases.

With each dynasty the story moves back to, martial prowess rises by roughly one level.

The protagonists are twin siblings, Shanqi and Shandai, who have no memories in any of their reincarnations.

That is more or less the basic setup. I wonder what kind of world it will become when I write it...