If you love FF Tactics, check out FFT 1.3

http://ngplus.net/InsaneDifficultyArchive/www.insanedifficulty.com/idwiki/index243a.html?title=Final_Fantasy_Tactics_1.3

and the solid custom stories/mods built on the FFT engine

https://ffhacktics.com/

There are some phenomenal rebalances and new stories for the original PS1 (and PSP if you prefer) engine.

FFT 1.3 is legitimately challenging (there's an easy mode that's worth playing too), ungimps the AI, and makes some fights quite hard. It completely rebalances classes to make them all useful and interesting.