My husband is currently taking lithium and it works but he needs to add something to help balance

He is currently taking Lithium300mg 1 to 3 pills a day, it does work well but we need to add something to help with his emotions and blowups. I researched some and wanted to see what ppl think...

Pristiq and Lithium

Rexulti and Lithium

Remeron and Lithium

Latuda and Lithium

I would like some advice and or recommendations on which might benefit him better as a combo. Can you give examples on how each will help.

Thank you in advance, Val