Answer:
I assume it is an Adverb due to how it is used in the sentence
Step-by-step explanation:
More can be an adjective, an adverb, a noun, or a pronoun, depending on its function in the sentence. This multi-functionality is an example of the flexibility of English, which can drive EFL students crazy. For example,
More rain is coming. (adjective modifying a singular noun)
More guests came than I expected. (adjective modifying a plural noun)
We tried more than twice to persuade him to come to the party. (adverb)
They arrived more quickly than they thought. (adverb)
The more I thought about it, the more I liked the idea. (noun)
More will arrive in stores soon. (pronoun)