As you are close to 20 years old, it would be risky if your parent were to file for citizenship now. Ideal scenario would be -- your parent files N-400 today, then completes the process and becomes a US citizen before your 21st birthday. Then he should immediately request NVC to upgrade your case to IR2 and also request for expedited interview based on your DQ date from 2022.
But, there is no guarantee that your parent can complete the N-400 process before you turn 21. If he files N-400, then becomes a USC only after your 21st birthday, it could be worse for you as your case will switch to F1 (unmarried adult child of USC), which is years behind F2A on the visa bulletin currently. One option could be for your parent to file N-400 ASAP, then if he still hasn't become a USC by Sep 2024, he could withdraw his N-400 application.
Or your parent could remain an LPR, not filing N-400 at all, and you both wait a few years until your F2A PD becomes current and you are scheduled for visa interview.
I recommend you discuss with your parent about these options, and possibly consult with a competent and trustworthy immigration lawyer.