I would recommend getting a bottle of Fritz TurboStart 900 and double dosing it and I’d bet your ammonia would be gone in 48 hours…anything else is more than likely a waste of money
I'm guessing if I understand right, OP is using Brightwell's Microbacter XLM. I also under went the same rise in ammonia as shown by also an API test kit. I also dosed Fritz 9 (not turbostart 900, which are the same bacteria, just different concentrations) and my ammonia was gone within 24 hours. My nitrite lingered for a very long time, even after a 100% water change, my nitrite and nitrate were elevated - 2 ppm, and 20 ppm. I believe the nitrite was actually higher, but went with 2 ppm for my records, seeing as it really didn't make a difference anyway, but I believe it was upwards of 5 ppm (API colors are really hard to determine) and stayed elevated for another 2 weeks. My nitrate increased from 20 ppm on 2/7 to 80 ppm 2/16 with only a 1" clown fish. I did several 30% water changes, and then 5 10% water changes. And another 30% water change to reduce my nitrite to 0.5 ppm (0.5 on API, 1.0 on Red Sea) and 10 ppm (same reading on both test kits). Buckle up, OP.Your numbers are gonna drive you nuts. Add Fritz - 2-3 days if ammonia is gone, and nitrate is reading, 100% water change. Add 1 fish. Go slow. I don't have nearly the experience that these other guys do, but I am just on the other side of the hill from where you are now.
Also, for others - myself, and my friend both experienced the exact same increase in ammonia, and sky high nitrites, started the same tank, with all the same stuff, at the same time, both using Brightwell.