When you exposed at EI 200, you exposed for the shadows. That part you got right.
Now the "develop for highlights" part is what you need to get your head around.
First off, if the scene was "normal", then all you have to do is develop normal.
Yes the negative will be dense. But it will have a "normal" range.
You would confirm by printing it on Grade 2 paper where it would probably look right.