When you have reached the end of autumn and cannot perform any more actions (or do not wish to), you have finished the game and must pass. If a player has passed, they cannot be given any cards or resources. If cards or resources have to be given to a player and all other players have passed, discard instead.
Any unfinished players continue playing until all players have passed. Then add up all points to determine the winner.
You may find it easiest to add up the base value of each card, then come back and add up point tokens, purple Prosperity card bonuses, Journey points, and Events.
If there is a tie, the player who achieved the most Events wins. If there is still a tie, the player with the most leftover resources is the winner.