DietPi-based embedded device

Hi everyone!

I have started to test DietPi for a quite big project. Our need is basically this:

A small Linux-based distribution that works for Raspberry Pi 4.
I did notice that the system came with alot of DietPi scripts and programs - which I actually do want to remove.

My question is - how to I make the image even smaller? What packages can I remove without breaking the system?
We do not need graphic at all, but soundcard is needed.

Let me know if I am not clear enough with my questions!