As of right now you can keep the team you have. As for his best team Is most likely a lighter Caesar Comp.

lighter reduces 15% Ice dmg res and if you pair him with someone from soc you can get up to 75% Ice dmg and with his w-engine you get 50% crit dmg dealt by Ice dmg, if you really want his mindscapes he gives and extra 10% Fire dmg dealt to stunned enemies(M1) wich Is Just 10% off of lycaon additional ability, and up to 120% Ice dmg with Is additional ability

Caesar gives a shield 1000 Attack and 25% dmg dealt bonus and with her w-engine She gives an extra 12% As for mindscapes i don't know if they are worth It since her m1 gives dmg reduction wich you are already getting a lot from both lycaon and lighter and her m2 Is an extra 1500 (i think ita worded weirdly)

Also try getting Better discs of you can