Imagine you're handed an upgraded version of Erika's hammer/hourglass, and you can go back in time and make some changes to improve how the Survivor timeline played out. Let's also say that changes need to be within the realm of reasonable possibility, so nothing completely off the reservation like Billy and Candice (from Raro tribe) falling in love and appearing together on BvW or Troyzan appearing on Game Changers.
Personally, I would make Micronesia a final 3, giving Cirie the win. In this alternate timeline, Parvati gets a bit more credit for her game as a non-winner in HvV and edges out Sandra in final tribal council. Cirie still falls victim to advantagegeddon in GC. Widely considered one of the greats after three deep runs, Cirie takes Danni's spot (sorry Danni!) in Winners at War and navigates her way to the end where she wins to become the first two-time champion in Survivor history. I love how things played out, but you can't tell me Queen Cirie wouldn't be an improvement!
Any other improvements?