It's not a champion problem, it's a gear problem. You are using 3* artifacts on Miscreated Monster, wich is your best champ. You don't have a banner for him, what could bring extra accuracy for his stun.
You can't expect to climb in silver with 3* gear on your champs.
On the long run you should replace Elhain with a better damage dealer, but for now nobody can replace her, because she is lvl 60.
With your current roster I would do this team setup for the time being until you get High Khatun or if your lucky, Gorgorab as your speed lead.
Spead Lead - Spirithost - ATK Up (2nd move)
Apothecary - Speed boost up/turn meter reduction (1st move)
Spider - Defense Down / possibly weaken also (3rd move)
Elhain or Miscreated - AOE atk to finish them.(4th move)
Notes: Make sure you have your team speed tuned. Over 200 is idea for your fastest champ. Like Skadi said: Get some 4-6 star gear on them champs for better overal power and upgrade them to a minimum of 12. Checkout https://www.deadwoodjedi.com/arena-calculator for a good speed calculator.