No, since being a nail tech and a content creator are two separate businesses, you should not use the same EIN. You can either be a sole proprietor for the content creator or register a new LLC. An LLC can also be an S corp for tax purposes, by filing Form 2553. Assuming you do not have any partners, report each business on a separate Schedule C (self-employment) on your Form 1040 personal tax return, whether it is a sole proprietorship or an LLC.
