What cards do you have? How much spirit do you currently have? Maybe the people on the deckbuilder discord or even us on the forums can salvage something from it. Getting a competitive creep deck and slowly building up to a fully fledged one is not too hard. Assuming that you already have Spectral Revenants and Keliano, this deck can feasibly reach S-rank.
Dirty Creeps Done Dirt Cheap

(Skorn can be replaced with card draw or good 4 drops. Keliano is irreplaceable)
This deck is close to top tier lists, including the one I ladder with and the one on Bagoum (go to site for Duelyst information) with a few high rarity cards swapped out for low rarity counterparts. Up until gold ranked, the deck should have little to no problems, since any tempo deck with a skilled enough pilot can do rather well. However, certain fast decks can cause problems. If you loose to an aggro Vanar who emotes a lot, that is probably just a high ranking playerās alternate account. (or the work of enemy Stands) Seriously, those things are everywhere and can be really discouraging to loose to.
Try to play a bit slower than regular tempo decks. Your win conditions come much later than your opponentās and Keliano will help maintain life total. If you have to, replace her with a good tempo 4 drop and play a tempo deck until you have enough spirit.
Oh, one last thing: it is vital that you play using Cassyvaās original, not MKII skin when using this deck. (you will need the stand power) As for music to listen to while playing, need I even say?