if you don't know which part makes it less intense, good chances are you also don't know yet what things would make or keep the intensity you want, so the basic requirement here would be more experience and abilities as a mapper in general to better reach what you want
in any case, you can always try looking for maps you like, maps for songs that have similar structure to the song you are mapping, and so on, to check what they have done to achieve the desired intensity levels, and try to apply something like that to your own mapping