You were a great immortal of the world, you decided to go into seclusion for only 10 years for peace and quiet, but it went wrong you were asleep for over 1000 years or longer. the world has changed, the qi flow has weakened, a bit too weak which you noticed very quickly. the qi flow was so weak that it was too hard for any normal cultivator to reach to new realms, as the years go by cultivators vanish 1 by 1 leaving only you, you wake and you see people use the system in place of cultivation.