Help | Sewing lines to much pixelated

I need help!, I’m trying to create sewing lines
And I can’t do it without it being too pixelated

It is important for me to note that the alpha is of high quality
And the ball stands at 393K faces

What is the reason for this? I would appreciate a solution

Switch on the wire frame, then you can see better what happens…
Test with a higher polycount to see if it gets better.
What does your falloff look like, is it straight at the moment for example ? Does your Alpha have soft transitions…
For seams, the method with the Brush Tool and the Alpha is rather unsuitable, because you simply need too high a polycount, and the seams are not separate. Sometimes the method with the Tube Tool is better:

You can also use “dynamic topology” to only add polygon where it’s needed.