The Verdict: Clear Path
You are already a Brazilian citizen: the registration of your birth is the recognition. Your next step is a current certified copy of that Brazilian birth record.
Citizenship by descent counts from your birth, not from the date of the paperwork, so there is nothing left to apply for.
After the birth record come a CPF tax number and a passport from a Brazilian consulate. If the registration was made at a consulate and never transcribed into a registry in Brazil (the traslado), do that too: it is the version offices inside Brazil ask for.
Send us what you hold and we will tell you which of the three is missing.