If you want to release your data, specify DDBJ/DRA/GEA accession numbers to be released. When only BioProject accession is informed, only the BioProject record is released and related data are not released. Similarly, when only BioSample accession is informed, only the BioSample record is released and related data are not released.
DDBJ/DRA/GEA data release triggers relase of referencing BioProject and BioSample. FAQ: How are linked BioProject/BioSample/sequence data released?

DDBJ

Inform accession number(s) of nucleotide sequence(s) to be released through the update form.

DRA

Login D-way and release DRA data by yourself.

GEA

Inform GEA Experiment accession number (E-GEAD-n) or Submission ID (e.g., ESUB000001) to be released through the contact form.

BioProject

Inform BioProject accession number (e.g., PRJDB1) or Submission ID (e.g., PSUB000001) to be released through the contact form.
When only BioProject accession is informed, only the BioProject record is released and related data are not released.

BioSample

Inform BioSample accession number (e.g., SAMD00000001) or Submission ID (e.g., SSUB000001) to be released through the contact form.
When only BioSample accession is informed, only the BioSample record is released and related data are not released.