This doesn’t mean that you can’t do other things. It just means, that if you create a wide variety of artwork, you must market it separately. Each body of work that looks like it was done by a separate artist needs to match up with its own potential audience.
If you have a number of different styles on your website, it might be time to get another site. Putting too much information on one site is confusing to visitors. When visitors are confused, they leave.