So everyone here knows that especially in low levels games people join and AFK regularly, it really disrupts the game and most of the time people just vote out the actives knowing the inactive are not a threat.
I would suggest to change the game a little bit where if you fail to nominate before the timer runs out, you automatically nominate yourself. So every turn you're afk is a self nomination, increasing the chances of ridding the game of AFK players. A more dramatic option might be automatic nomination regardless of votes, but that might be a little too harsh and game changing.