There was temporary peace in the world after the War of the Six Realms. Although cultivators across the known realms would stir up conflicts from time to time, they did not cause any chaos. After all, they were just a bunch of disunited rabbles without Emperor-level forces turning the tide of war.
Ye Futian did not drown himself in cultivation during that time. Instead, he invited cultivators from Ziwei Segmentum and Nine Supreme Regions to Ruins Continent by repeatedly opening the portal between realms and leading them to the destination. In doing so, more cultivators had the chance to enter the Ruins Continent for their cultivation.