The application stays valid until documentarily qualified (DQ). At that point his father needs to actively pursue a visa or the petition will be canceled. So the son or father can put this all on pause while the son establishes himself in the U.S.
Given the failure to follow the previous advice, this should be paused until the son is working and living in the U.S.
The length of the pause depends on whether a joint sponsor is used.
If no joint sponsor, pause until 2026 when the son has 3 U.S. consecutive tax return transcripts each showing sufficient income.
If a joint sponsor is used, pause until the son has a U.S. lease, U.S. job, U.S. state ID or drivers license, U.S. mobile phone number with a U.S. mobile phone provider, and U.S. bank account.
At the start of the pause, notify NVC, that because the petitioner is not yet qualified to be a sponsor, the beneficiary is delaying pursuit of a visa interview. Do this every 6 months while the pause is in effect.