When using not only . . . but also in a sentence, parallelism should be the
goal. It means that the words following both parts of this correlative
conjunction (i.e., not only and but also) should belong to the same parts of
speech. For example, if a verb follows not only, then a verb should also
follow but also. Using different parts of speech after each part of not only
. . . but also makes the sentence imbalanced and, frankly, just awkward.
Consider the examples below:
(incorrect) He's not only intelligent but also has a great sense of humor.
(correct) He's not only intelligent but also funny.
https://www.grammarly.com/blog/parallelism-with-not-only-but-also/