Kayleigh Bateman Here's my take. There are 2 key pieces of data that will help better define the audience. First is titles.
Are they up to date. Keep it simple. C-level, VP, Director, Manager, Specialist.
Second is relationship. You identified main point of contact. Would add admins, advocates, active user of your product, inactive user. You may want to add highly engaged contacts (attend webinars, open emails…) but not sure if that is necessary early on as it's more complicated and not sure if it changes who you be communicating with.
Hope this is helpful. If you would like to chat 1-1, LMK.