This post is inspired by the suggested Refugee role a few weeks back.
I suggest Three changes to Survivor.
1: Remove 4 vests mechanic. He now has Basic defense until he sacrifices it. Once lost, it is never given back.
2: The Survivors ability is replaced with an ability to pack up, this will make him lose his defense, which includes on the night he packs up. After words he will have a cool down night as he prepares to leave town where he cannot do anything, then he will have his ability replaced by an option to leave town. This will cause his to just up and disappear from the game. He will leave a "Last Note" (a re-flavored last will) and during the death toll the next day he will not be present, the camera will zoom in on his spot where a small scrap of paper now lays. In the graveyard his cause of death is "Left". If he is attacked or interacted with in any way, the player that interacted with him will get the message "Your target is nowhere to be found". These abilitys cannot be interfeared with by a Roleblock or Transport, and can even be done in Jail allowing him to dodge a execution if it was prepared.
3: The Survivor only wins with Town, Executioners, Jesters, Pirates, and other Survivors. Reasoning being that these are semi-neutral/good roles. If an evil faction such as the Mafia wins and the Survivor has not left Town, he will lose. The Survivor will not be counted as a Town role and the Mafia can automatically win if only a Survivor is left alive, with the Survivor losing.
Reasoning for this suggestion:
The Survivor as it sits is one of the most controversial roles in the game as it's purpose has been boiled down into "Surv Claim D1". Yes, you can do other strategies, but just flat out claiming Surv is the most effective as it means killing roles will disregard you, as you probably will have defense, and TI will be suspicious of you, meaning you will be investigated, and found not suspicious, unless doused/hexed/or framed.
This effectiveness is seen in the Survs high win-rate, he kinda just watches.
This also means that many players (present company included full disclosure) find the role to be boring. As you have no proper ability other then getting basic defense as you go with the majority and try not to seem like an evil, a job that comes down more to luck in the Chaos modes where Survivor dwells. A common talking point is that playing Survivor is like being Dead N1, as you don't really have much impact.
What little impact you have is my next point.
The idea of a role that wins with everyone is cute, however it leads to arbitrary victories. Situations where two sides gave it their all, fought tooth and nail, and now its them at each others necks, with Tim the Surv that went afk N3 and just got back being the deciding factor.
In this situation, it is the worst role to play against, victory is quite literally decided by a anon on the internet like its a forum debate, and they can use whatever reasoning they want. I personally, have been in this position, and have snatched so many wins from people on the meek merit of "I like the other guy".
To attempt to remedy this, I recommend the suggested changes as they achieve two goals.
1: Making the role interesting, needing engagement and strategy to win.
2: Remove the negativity bias of having wins stolen from players because one Melvin sat around in a monkey suit and decided that RPS via text is the best idea under a time limit.
If the win condition of winning with everyone is to be used, it should be with a play style that's fun, not sitting there being a wannabe king-maker.
(Also I think the idea of having Survived is ludicrous, especially when he "Survives" with Horsemen of the Apocalypse and Tarnation Serial Killers or Arsonists, you're just gonna die in a day dude, you didn't live through Flummery. This is a more Survivor based Win-Con But that's just a nit-pick aaaaaaa)