Need help with ore generation 2025.1

I'm new to mod making, and for some reason, My ore generation just doesn't work in mcreator, And I don't know why, I've looked for days why, I've even made a ore generation feature, and although it did work, it generated really badly and weird, and I made that feature with this video: https://youtu.be/hiB8Zg4sF1w?si=fd9mIKrTQutuuKgS

PLEASE somebody help, I've seen alot of people with this problem to. 

I'm using 1.20.1 forge

And all of the tutorials are outdated noways, Maybe I'm just missing out on some things, Or I just havent done enough research or i'm just doing to much and its really obvious.

Thank you :)