when you did a water change did the nitrite levels change at all? For reference when I had a nitrite stall, I did the 40% change and it was cycled a week later, so it still will take some time.
Problem is when doing a fishless cycle, all that ammonia you dose turns into nitrites which can build up to very high levels when dosing 4ppm everyday before there is nitrite bacteria present, stalling cycles or causing it to take a while. Your levels are probably off the chart, which happened to me as well and I believe is quite commom.
I would wait a few more days, see if there is a reduction in nitrites, if none after a week do another water change to bring the nitrite level down again to help out.
Problem is when doing a fishless cycle, all that ammonia you dose turns into nitrites which can build up to very high levels when dosing 4ppm everyday before there is nitrite bacteria present, stalling cycles or causing it to take a while. Your levels are probably off the chart, which happened to me as well and I believe is quite commom.
I would wait a few more days, see if there is a reduction in nitrites, if none after a week do another water change to bring the nitrite level down again to help out.