To get more contrast out of the negative, you develop your film longer. This is one of the basic controls of photography you should learn, because it comes in handy as you shoot in different lighting situations.

If you have to print at Grade 5 to get what you want, and want to get down to something like Grade 2-3 instead, start by increasing your development time about 30%. See how that works. Do a test roll, so you don't muck up something important.

It is not a good idea to go by visual inspection to judge whether you negatives will print well or not. That is something you learn with time.

Good luck!