Remaking the world was Xehanort's ultimate plan throughout the Kingdom Hearts franchise.
Once Xehanort learned about the Keyblade War, and saw the folly of the worlds today, he deemed the current World a failure. He decided the only way to make the World right would be to purge the current World and start over, with him as leader to stop anyone else in the future from possibly polluting the World with darkness. That is what set all of the different events throughout different points in time. The only way for Xehanort to do that would be to use the χ-blade and Kingdom Hearts. While he gave off the impression to his enemies and even subordinates that he sought equilibrium in the World and wanted to end the "Tyranny of Light", this was all a ruse, no one knew what his true goal was.
Xehanort almost achieved this goal in Kingdom Hearts Birth By Sleep; however, he was thwarted by the combined efforts of Terra, Ventus, Aqua, and Mickey. He attempted to achieve his goal a second time throughout Kingdom Hearts and Kingdom Hearts II, but his plans were stopped this time by Sora, Riku, Mickey, and Aqua. Xehanort developed a contingency plan in case his attempts with Ansem and Xemnas proved to be a failure that resulted in his revival and the formation of the real Organization XIII. In Kingdom Hearts III, Xehanort had finally put his goal in motion after forging the χ-blade. He tried to purge the world immediately once acquiring the χ-blade but was stopped by the Seven Guardians of Light, trapping him in the past at Scala ad Caelum.
Sora gives chase to Xehanort and defeats him thanks to the additional help of Donald Duck and Goofy. Xehanort still tried to purge the world after his defeat but after hearing some powerful words from Sora, who stated that remaking the worlds isn't his decision and a real leader accepts that destiny is beyond their control, and some persuasion from Eraqus (who survived in Terra's heart after being slain by Xehanort) gives the χ-blade to Sora and stops his plan with newfound respect for the boy.
After that, he departs into the afterlife with his old friend Eraqus.
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