Unable to create a pronoun bot that allows for ONLY predefined OR custom pronouns.

I'm trying to create a pronoun bot that allows for already defined pronouns, and if there are non that the user requests, allow for custom ones. Once the message is sent and it is custom it would just create the role and add it to the predefined ones. However my problem lies in that both "options" can be used simultaneously, which I don't want. How should I go about doing this? Also, if possible see where I can improve my usage of the builder; I'm pretty new to djs. Here's my code:
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