You cannot advertise your business on social media if your business does not have a dedicated Page for it on at least one of the social media platforms. This is called a Business Page.
Note that a Business Page is different from a Personal account. For example, you might have a facebook account in your personal name, but you will also need a page on facebook that is just for your business. This Business page can be accessed from your personal page, of course.
You will need to have created a Business Page on each of the social media platforms that you want to advertise on eg LinkedIn, TikTok. Note that you don’t have to have a Business Page on both Facebook and Instagram to be able to advertise on both. If you have a Business Page on Facebook, you can advertise on both Facebook and Instagram.