There is a whole section on starseeds. Go check it out.
There is nothing that says you cannot be both a starseed and an indigo.
Indigo - octarine - crystal is just sorta a progression path.
If you are on that line, you will have parts of all three.
You seem to want someone to tell you, "You are this, therefore, you are supposed
to be doing X,Y,Z." Well, sorry, there is no telling you what to do.
Indigo and starseed are just handy containers for talking about certain aspects of self.
Explore them and see what pieces fit you and allow you to understand yourself more.
As you understand yourself more, you will understand what you decided to do this lifetime.