Keep doing as you are. Test water daily and till your ammonia is down to near 0ppm do 50% water changes. Generally you want to be doing 25% water change if your ammonia or nitrite is readable. Your tank will be cycled when you consistently see 0ppm ammonia and nitrite and your nitrates are steadily rising.
I would also recommend reduced feeding until your ammonia is more under control. Either light feeding daily or a full feeding every other day.