Not to mention that strictly speaking,the Void does not have to be restored per se. Much like Auamrot, the original denizens of the Void were lost long ago.
Likewise there isn't much reason to visit the other shards as the calamities can and had been prevented Source-side preventing the worlds from even meeting, the First was only an exception because the method of the 8th Calamity was something that also killed us and also something that was hard to prevent (being a chemical weapon and all).
(this also means that we might face ourselves if the glowing people are WoL of dead shards and timelines is true)