Question! How to adjust Magnetic filed with my points

Hi! I want to make Magnetic filed with my points. but the thing is that I tried to put my Points instead of Populate Geometry and It’s not work.

I already have some points like this

and I want to make the magnetic filed like this

And this is the algorithm from youtube for my Magnetic filed

Therefore the main issue is that I have my exact points. so I want to put my exact points instead of Populate Geometry. Furthermore, I want to know the reason that this algorithm has a random box.

And I want to change the size of Circle by my self as well.

If someone know about solution, I would be really happy! Thank you so much!!

Magnetic fild (14.5 KB)
Magnetic filed from my (18.1 KB)