For the sentence, - J'ai plein de parfums !, would - J'ai de nombreux parfums ! be acceptable. It was not given as an alternate.
Freeform Writing Exercise A2
Here it is just a question of register the two alternatives given for 'lots of' are -
and you have to ask yourself what a vendor might say as 'de nombreux' is more numerous .
In terms of register, you would have -
plein de ,
Hope this helps!
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