I already sent the letter signed by my father(applicant) and for now, we are waiting for their reply.
You may submit a signed letter as to why you did not take action on the case within one year following notification of the availability of such visa.
The signed statement may be sent as a scanned email attachment to the U.S. Embassy in the Philippines (Attn: Immigrant Visa Unit) at https://ph.usembassy.gov/visas/immigrant-visas/immigrant-visa-inquiry-form/ , with your name, case number, and current contact information clearly indicated.
I hope this helps, good luck!