It’s not just do this get that much isk ships fitting skills and player knowledge play a huge part in everything.
Also no one will tell you exactly what they do and how to do it because they are likely heavily involved in that activity and don’t want competition.
An example when I used to nyx rat most of my peers with same skills and fit would reach around 240-270 mil/h I’d reach 360/h all the time-knowledge of sites.
When I was at the peak of my trading experience everyone was baffled how I’d make 100bil a month
Stuff like this you never share with anyone except people you’d been close friends with for many years in EVE