Slow to fully cycle

My tank is slowly comming around to a full cycle. The tanks ability to
remove ammonia is good, I can add drops of ammonia to read the max on the
scale of the test kit and in 30-45 mins the level drops to the safe area,
and after a few more hours the levels area ll very close to zero, but the
nitrites and nitrates havn't budged, they are still reding at the top of the
scale, is there anything I can do to help push this cycle along ?