just looking at the picture... so many things wrong. you could probably win that battle just by changing the order of your champs.... but based on that you probably also have the wrong gear, and someone else on roster to fit 4th slot better.

step 1: hk is leader

step 2: hk needs most speed, wm next (need accuracy), kael

step 3: replace ss

post roster picture for help

Obviously you're right about all the things being wrong, but unless that Yannica and Khoronar are terribly geared, I don't think he wins the battle even so, not until most of his team is also level 60. 

Also, I'm not so sure about replacing Sepulcher... for any battle that's going to take at least two rounds anyway, having Sepulcher to neutralize the opposing team's first round nuke could be worth sacrificing a Spirithost attack boost for. And with bronze being as tough as it is, many battles probably will take at least two rounds. 

I may have over-reached a bit... lol.  But I don't think OP should worry about anything past round 1 though.  Going 1st and taking out most of team only way a new player going to win these days.

Have dropped from gold 4 to gold 2 in the last few weeks and still going down fast. At least in gold 4 lots of people had a single arbiter as there  defense now all i see are what seems like platinum defenses 

Maybe the OP could not win this battle with the changes Trips suggested. But to win other battles it's still a very good way. Using Kael as leader for a small 15% hp aura is just bad when you could have High Khatun instead. 

Another obvious improvement would be just to level up the champs. Warmaiden is only at 40. Lvl 40 champs don't win against lvl 60 champs.