The Middle Thousand World lacks stars; either create one, or have a subordinate Star Lord take the position.
If that's the case, then the Small Thousand World will need to select a new Star Lord.
Alternatively, wait until the Star Lords of this realm achieve Harmonization, then send their avatars to the Small Thousand World.
Both methods are viable.
After all, the Upper Pure Demon Tribulation has passed, and there are still ten thousand years until the next Small Thousand Demon Tribulation.
The Demon Tribulation of the Wushan World also concluded just over a thousand years ago.
The Altar Temple World still has five thousand years to go.
The latter two experience fewer Demon Tribulations, both being in the single digits and of low level; the Small Thousand Worlds can handle them on their own without requiring my intervention.
The remaining matters involve completing the Sun and Taiyin.
These two are indispensable.
