first of all:
gold/plat doesn't mean nothing: u can grind gold with a little bit of luck using almost every upped deck, u can't do this with plat
for your deck: i don't see any win condition in this deck, in every match u should be lucky enough to pull out from sose something like ffq or pharaoh; i don't think u will be ever able to play 6 sose without locking your hand
- 2 qtowers, -2 sose +2 ffq or 1 firefly queen and 1 lava destroyer/steam machine, + 2 quintessence, other than this 2 sofos are enough
other than this, there are a lot of options, some in contrast with other cards u have:
i will totally play an oty in every deck, but u already have 3 sofo; maxwell demon is super crap, but in combo with eagle eye can do something... but the eagle's eye quanta is needed for ffq, so u can try pharaoh, perahps?
other options:
when u have only 2 wincondition in a deck, i will always play eternity: deckout against gold deck can happen easily, pandemonium is cool against everything, rain of fire is super cool against air rush decks
these are only hints, there are a lot of bows in the forum, if u want some inspiration, u can check
http://elementscommunity.org/forum/rainbow-decks/tha-gold-league-killer-v2-0/http://elementscommunity.org/forum/rainbow-decks/the-bone-collector-(silver-league)(bronze-league)/http://elementscommunity.org/forum/rainbow-decks/the-jmz-classic-(rainbow)(silver-league)(gold-league)/