Assuming they are upgraded, try using warriors instead of archers
Toggle defense stance right after you break down the first barricade
Keep defense stance on until you have destroyed the last lapetos tower
Walk over spears, bombs, skulls as usual
I would also use spindle instead of gaze
I don’t know if you’d beat him, but I am quite sure you will get better than 56%. After this, it will just be a matter of tweaking your spell usage, figuring out when is the best time to use them etc.
You can also park your hero closer to him before attempting this attack again. You’re probably going to fail a couple more times before you succeed.
Practice and experiment without using gems first. -3 trophy is not a lot to lose compared to what you might be able to learn from each attack.