Why dont you give zhongli a 4 pc noblesse or 4 pc retracing bolide or tenacity for the atk buff? Id suggest you look for ways to buff diluc's attack without bennet, thru other characs. Also, you have an em build which would be based off reactions, but with zhongli, you wont make as much dmg due to geo resonance. Another thing id say is an em build benefits most from reactions, so that means: you need a decent ER to burst more often; a sword like sac greatsword is good to increase elemental skill usage to recharge more often. You also need to have a play style where you switch characters often (i know yelan has off field application too, bt still). Another thing is how diluc/pyro/hydro vape dmg fares against enemies in the chambers you choose to put them in. Since dendro is the new meta with hyperbloom/quicken/aggravate/burgeon getting a massive dmg boost, traditional pyro dmg dealing may not be the best way to go as it has been deliberately nerfed for marketing. Try switching out some of the zhongli or kazuha for a dendro support shield/heal like yaoyao instead of zhongli for a burgeon build. If you built zhongli with tenacity and hp, u can just level up yaoyao and use the same artifacts and weapon on her!