I applied April 2015 for N400.
After the finger prints took 3 years. I sued the USCIS, and did every thing in my power.
No one can help you . Just forget it and one day you will have interview like me.
after 3 years I had interview and finally I was naturalized in May 2018.
If your name check gets a hit, it takes months if not years to clear it up. Your country of origin , and how common is your name plays into factor.