There are many decks which were undefeated in September. So if you want to have some examples to follow then check the link below. But honestly if you don't to want to spend A LOT of money to have for example 20 epic, 20 rare cards in the deck what is commonly used then stay with your deck and play HEX just for fun. It is not a cheap game if you plan to be the top player.
HEX: Shards of Fate – undefeated decks
HEX: Shards of Fate - undefeated decks. Check them!