Fishless Cycling

Hello I am into my 5th week of fishless cycling. For 2 weeks my ammonia was 2 ppm , nitrites 5ppm, nitrates 20 ppm, ph 7.6 water temp 76 f .
Now for the last 5 days my Amm is 0 , nitrites 5ppm, nitrates 20ppm , ph 7.6, temp 76 f.
I get hardly any ammonia readings i've tried doubling the dose of Ammonia too. I was hoping the nitrites would go away so I could add fish to my system. What do you think I should do next?

Thank You So Much!