The short answer is yes, it is completely possible, some of the methods are, the most used, affiliate marketing, then the gifts that the lives give you, you can also create content for brands, the latter is less used because it requires a certain popularity but very possible and finally make narrated content with audio off to sell to other people, this is also widely used, surely there are maybe some more that I am overlooking, but these are the most typical and used ways to monetize tiktok without showing your face, the truth is that it works and works very well, by trying it once and monetizing once with one of all these methods you will see that what I am telling you is true, I hope my comment is of great help to you