Let me join in the chorus of recommendations for the water change and bottled bacteria. In addition to that pay attention to some of the recommendations that say go very low light or no light for a period.
Be ready with a clean up crew plan, as signs of life appear on hte rock and glass.
From the nature of your questions and response to the suggestions I predict great success for you in the short medium and long term. Best of luck, stay in touch, and will all be following along to see how you do. And lastly I do think an improved set of test kits primarily for nitrate are in the future. By the time you get those you won’t need ammonium or nitrate
And patience is a virtue, be virtuous