2 ways to be sure about cycle.
1. get pure ammonia. Dropper it in while testing the water. Pick a color on the chart that isn’t max. Repeat test in 15 mins or so, if it returns to normal and your nitrates go up congrats you have a cycle.
2. get some cheap fish like danios(15-20), feed them, repeat tests above, although you shouldn’t be able to get the ammonia levels to rise this way. If you see ammonia rise with just small fish then you don’t have a cycle. Butif you’re careful with feeding and wc they’ll get your cycle going for ya.
Can try products like Stability but ymmv