I began creating my profile, and didn't realize that I would be "locked in" to a specialty. I can't find any information on how to change this; the support bot suggested that I contact support, but nowhere on the site can I find support
Are you referring to changing your skills? If you do, you can always update it by going to your profile and clicking on the pencil icon to update your skills. You also have the option to create specialized profiles to tailor your unique skills to your audience on Upwork and create variations of your profile that showcase your experience within specific categories.