Trying to make a tsunami in your world.
- Download the latest version of NotSoTsunami from releases.
- Launch Minecraft.
- Go to the singleplayer world selection screen.
- Click on 'Create New World'
- Click on 'Datapacks'
- Drag and Drop file
NotSoTsunami.zip
onto this screen - Move the datapacks from "Available" on the left, to "Selected" on the right (click on the arrow next to the datapack icon)
- Have fun!