I'm a big fan of the elderscroll series, my main interest in the game is the role-play fantasy aspect, questing through the great story-telling wich this game provides.
In a single player game I can try out different choices and consequences to accomplish a quest, I can make all the tests I want and explore various results with save/reload. It really annoys me that I can't do it in ESO.
My suggestion is to have a menu to select a quest you previously done before and reset it so you can do it again. You dont get the rewards of course, but you can alter the ingame conclusion you had. Sometimes you missclic, chose rapidly without thinking, or it just feels the choice you made doesn't fit your character.
For obvious reasons a save/reload option is not possible in a MMO, but the option to redo a specific quest would do the trick to salvage choices a player makes and regrets.