32 days to reach Gold 2

I'm using one of those sites that pay you if you achieve certain goals in games.

One of the challenges is reaching Gold 2 in Arena. I'm currently bouncing between Silver 3 and 4 with the team pictured. The idea is: -Kael/Zavia = Nukers -Wukong = Debuffer -Wyrennon = Support.

As you can see, my stats are pretty bad, so I'm thinking my best strategy is to farm dungeons for better gear.

-Do ya'll have any advice on which dungeons to farm? -Is it worth farming for artifact materials? -Should I focus on masteries first or gear? -Is it worth focusing on making Wyrennon Rank 6? I find her support very helpful in PvE and PvP.

Any advice is greatly appreciated.