Hey. im basically a newbie on this and i dont know where can i find the config files, for example,of the mobs health and life, i decompressed the .jar file and found the .class of the mob but i cant find the parameter of health and all of that stuff, also idk how to stop the generation of some structures like satyr camp and small shrine, since i dont find their spawn rates anywhere else.
If anyone can help me i will be so thankful

There are no config options for mob health.

What version of Greek Fantasy is this? In 1.16.5 there is a config file (that does not require decompiling the mod) where you can change structure spawn rates. In 1.18+ you are required to make a datapack for that due to internal changes to Minecraft.

There is no easy way to change mob stats in modern Minecraft due to internal changes to the game. Maybe you can find a mod that allows you to change stats of any creature, if such a mod exists