Deeper World~ (SOLVED)

Since 1.17+ Mojang has made possible to change worldgen with json files, I see you asked for 1.19. If you are trying to change the world height/depth for 1.19.2, go to misodes website in order to det the reference json files.For 1.19.3 or 1.19.4, you will need different sets of json files. Worldgen has been changing a lot.

 https://misode.github.io/dimension-type/?version=1.19&preset=overworld&…;

You will need the dimension_type and noise_settings for your json files. As an example for the Overworld you will need the proper overworld.json in the dimension_type (short format) and noise_settings (long format) folders. If it is for a custom dimension, then the files will have your dimension's name (generated by MCreator, but you must modify the files manually in all scenarios). There you must change the:
   "min_y": -64,//lowest min -2032
   "height": 384,//highest max 2031

to your desired values. These values must be divisable by 16. More info in ... https://minecraft.fandom.com/wiki/Custom

Also make sure the ligical_height is not greater than height. I prefer to set it the same as height.
 "logical_height": 384,//highest max 2031

If you want to remove the lava below -54, then you will need to create mixins. In my case, I have created mixins for 1.19.3, 1.19.2, and 1.17. Sometimes these mixins are difficult, I am still working on 1.18.2's mixin. You can also change the cave formations and/or terrain. Anyways, this is not an easy topic to teach ... but it is not difficult to understand either. Can't post the code here, it has a few thousand lines. 

Best wishes!

One Question:

Where do I need to put the .json file?

For future reference.

File location ... for Overworld

src\main\resources\data\minecraft\dimension_type\overworld.json (short format)

src\main\resources\data\minecraft\worldgen\noise_settings\overworld.json (long format)

File location ... for Custom dimension

src\main\resources\data\mod_id\dimension_type\dimension_name.json (short format)

src\main\resources\data\mod_id\worldgen\noise_settings\dimension_name.json (long format)

Saving this for later, yall are amazing