People talk about weaknesses but nah, every single fight has the same "weakness".
1. Hit them with fire until they burn
2. Spam stun attacks until the burn wears off or you can finish them with one of the high cost attacks.
*Some* fights have specific tells where you need to dodge or specific debuffs that lead into grab attacks if you don't cleanse them, but that's just guess and check like the person above said. Most enemies have a weakness to a specific attack or element, but it is rare that this weakness is more reliable than praying for good RNG with burn/stun. Importantly, if you get bad RNG a lot of fights are legitimately unwinnable even at level 99 with the best gear.
Speaking frankly, the dev seems very inexperienced and the game is objectively pretty bad. As the game progresses it seems to me like the game gets better in the sense that the dev seems to be learning as they go but it's never going to become a good game. That said, if you like the fetish content presented there's not really many other choices so I rate this a solid "better than nothing".