All things being equal you have about a 40% chance of winning. Unless of course you're a neutral benign. So how about....
CHALLENEGE MODE!
Allow Survivor, Executioner, Jester, and Amnesiac to type -challenge before day 2 to initiate challenge mode.
The town will be notified that a neutral benign has initiated Challlege Mode
And if they do their win conditions change:
Survivor must catch 2 attacks
Executioner gets a new target at the beginning of day 4 (both must be lynched for him to win, he isn't notified what the second targets role is, it can be of any alignment, and he loses night immunity when he gets the new target)
Jester Becomes the random guilty voter that suicides and if lynched again a random person will die (not just a guilty voter. This way if he gets a maf/cult they won't have an advantage. And clever folks with little chance of winning can push for his execution.
Amnesiac Does not choose who he becomes, and will revert back to amnesiac after 3 days
They should probably get bonus points too.