I've had the new feature of Mr. Toffee's Fair for a while now and am growing increasingly frustrated with it. For one, because often times the one square required to complete a line gets blocked by another player for days. Second, because most of the times I feel like I am the only player actually completing quests at all, while the other players just benefit. They might be bots, but I'm giving you the benefit of the doubt there.
My suggestion is to reward players with boosters, once they have completed say 12 squares. That way you could give an additional incentive to players to actually engage with the new feature of Mr. Toffee's Fair and reward those, who put in most of the work.