Here's a Steam search for strategy JRPGs.

Here's a few personal recommendations:
https://steamhost.cn/app/1850510/TRIANGLE_STRATEGY/
https://steamhost.cn/app/1488200/Symphony_of_War_The_Nephilim_Saga/
https://steamhost.cn/app/790820/Valkyria_Chronicles_4_Complete_Edition/

https://steamhost.cn/app/1932640/Suikoden_III_HD_Remaster_Gate_Rune_and_Dunan_Unification_Wars/

Some great tactical RPGS here. That is if you never played them. I suggest you try them at least. Has many rpg elements with tactical big battles between areas too.

This is probably a pretty good one you should try:

https://steamhost.cn/app/1451090/Tactics_Ogre_Reborn/

Alot of NIS games also have tactical fighting like the DISGAEA series and other games in the series.

https://steamhost.cn/bundle/25539/Prinny_Presents_NIS_Classics_Collection_Deluxe_Edition/

I would suggest unicorn overlord, but you know..sadly it is not on steam.

You could try some Tactics games like the Agarest series

https://steamhost.cn/bundle/9077/Agarest_Series_Complete_Set/

Gear Tactics

https://steamhost.cn/app/1184050/Gears_Tactics/

Xcom

https://steamhost.cn/bundle/20109/XCOM_Ultimate_Collection/

etc.