Easiest way to do it would be to expand turns into a system more akin to turn-based strategy where you can do a certain number of actions per turn. All existing things that consume turns would have to be adjusted into a certain number of actions, some simple ones like basic crafting recipes might have to be made to 0 actions. Complicated recipes might have to stretch through several turns. Vehicles would be complicated, but they would allow you to move many times per action. Waiting would be almost pointless, and sleeping might have to be replaced with something like “rest” where you give up your entire turn in exchange for some hp. Night time would be “set up a torch and craft” time, or get the jump on other players with your nightvision.
It sounds reasonably doable, but there’s no way for multiplayer like this to exist side by side with the single player that we have now. You’d have to make a whole new game and rework the turn system.