The thing with nominalizations is (whisper it) they aren't inherently bad.
I know, I know, there will be innumerable writing bloggers baying for my blood the length and breadth of the internet. Or there would be, if any of them were to read this.
What is actually more likely to be a problem is over-using or misusing them, but the same is equally true of over-zealously hunting down and eliminating every last one from your writing.
Instead you should consider what you're trying to say and the effect you're aiming for with the reader.
Say your story's characters have asked the local ruling council for some aid in their Epic QuestTM who consider the request and then refuse. Now compare these two sentences reporting on the outcome:
Using the nominalization -
The decision of the council is no.
and avoiding it -
The council has decided no.
So what are the differences? The first is a couple of words longer, it has a greater level of formality and it also places a greater level of significance to the decision by making it the prime object of the sentence. This is not "a decision" it's "the decision" and that can convey a subtext of firmness and finality to it. The second is more lightweight, quicker to read and leaves the emphasis on the council alone.
So when might you choose one over the other? The answer is that it's situational - if you've got a member or representative of the council informing a character of the outcome of a request the more formal usage would likely make far more sense stylistically. The tone is much more that of a statement or pronouncement rather than the opening line in a conversation.
On the other hand if this is someone affiliated with the characters who is reporting back to the others on the outcome it would seem more natural for them to speak more informally and the denominalized version would be the more obvious choice.
A common criticism of nominalizations is that they can lead to dry, dense language - particularly if there's a lot of them in a sentence or passage. While that can certainly be the case - sometimes that's exactly what you're aiming for at a given moment.
The key is to think about why you're using a nominalization, not with the automatic goal of removing it but instead to see if it's use makes sense in that context, whether it helps or hinders what you're aiming for. If you aren't sure you can always swap it out and see if it's any better or worse without.