This could actually be a two-fold problem. The first is that games have become to easy. With your high win rate and consistent
game plan, things aren't a challenge anymore. I'm going through the same thing right now. As bad as this sounds; it's lonely at the top.
But that's not something that can be fixed through deck-building, so let's focus on what we can do. You said you usually win with a token swarm, but you want something new. How about this weird build.
Use
Persistent Petitioners, lots of them. They count as creatures going into your graveyard, so the token swarm is still there.
Bloodbond March will get back any petitioners you mill away. You can keep a lot of the same self-mill cards, but the game gets riskier the more you mill yourself. This leads to your alternate win;
Laboratory Maniac. Slot in
Dread Return so you can sacrifice three zombies to bring Lab-man back just in time for you to draw that last card.