Why soft reject. Please help me

Please use Black ink only (no C, M or Y). In the reviewer screenshot I can see you used C, M, Y.

Should the

text be black?

I am not much familiar with graphics. I think reviewer didn’t mean text color, meant the rich background color you used in your template. Just a suggestion you can use:
Regular black - CMYK values of: C = 0, M = 0, Y = 0, K = 100

But you should take advice from a graphics author like @n2n44 @DesignSomething

The document must be set up in CMYK color mode and as @mgscoder said C = 0, M = 0, Y = 0, K = 100. This applies to all black elements not just for text.



well I have always learnt that for print purposes, black color should be either 30/30/30/100 or 40/40/40/100 and that the sum of all figures should not be over 230. Besides , as for I have always been told, this is also for “drying” purposes

That’s only for large black surfaces. When there’s small text or fine-lined graphics then rich black can cause issues, so it’s best to use only black in those situations.