You should choose workcation/remote worker and supply the items/documents that they require for that visa application. There are many people who own their own business who have applied and received the DTV.
that will not work. They do not unreject a decision. The OP needs to apply again with correct data. Anyway, it's not possible to change what you filled in, only send additional documents if asked for.
I just uploaded a verification from my employer of my position, tenure and remote working status. That was sufficient for my embassy (NL) but other embassies could differ.
Anyway my employment contract is 22 years old and bears no relation to what I'm doing at the moment 😀