How to increase phone number limit

My company portfolio has 2 WABAs, both have at least 2k conversarions per month (rated as high quality) and we need to add another one due to business purposes, but the ticket that you create to ask for an increase just says "Hi,
Thank you for reaching out regarding your phone number limits for your business account.
We must inform you that your account is not eligible for a manual increase at this limit. You may gradually increase your phone number limit through continued use of the platform. For more details on how these limits work, feel free to check out our documentation here - (https://developers.facebook.com/docs/whatsapp/cloud-api/phone-numbers/#registered-number-limits)." and there is no real reason why, and just creating another business portfolio for us it doesnt seem the right way to do it.