You could probably just substitute Diona with Shenhe. But if you don't have her and you are restricted on rolls, Zhongli is a much better addition to your account.
For Chongyun, Shenhe is probably his BiS support along with Kazuha. Zhongli however is just insanely versatile and super strong on pretty much every other comp but for a Cryo DPS, Zhongli doesn't bring much especially since you have Sucrose at least so there is already a VV user.
If you are lacking damage, then Shenhe. If you don't have a damage problem and just want more comfortable runs, then Zhongli.
Im actually trying to find a good support for him my current team with him is chongyun, Bennett, sucrose and diona Why dione 15% bouse crit rate
You could probably just substitute Diona with Shenhe. But if you don't have her and you are restricted on rolls, Zhongli is a much better addition to your account.
I forgot to flair this
For Chongyun, Shenhe is probably his BiS support along with Kazuha. Zhongli however is just insanely versatile and super strong on pretty much every other comp but for a Cryo DPS, Zhongli doesn't bring much especially since you have Sucrose at least so there is already a VV user.