[Team] Ult Krishna looking for suggestions

NA

Athena is hardest clear

(lead)Ult Krishna lv 99

Ult drake rider (dragon car) lv99

Ult Chiyome lv62

Ult homura lv58

Ult echidna lv.64

(helper)Ult Krishna lv 99

I can swap cards for Gigas, Urd, mitsuki, Ameno, Hera-ur, and goemon(i disagree with this one)

I am willing to iap however only lightly (max 20$)

Im just looking to improve the team overall because i really do enjoy krishna's playstyle however i feel like this team could be much better. If you could can anyone name a possible sub for this team to improve it?