If you still have a nitrite reading then you haven't completed the cycle. There are plenty of articles the go into detail about the cycle, some that go into way more detail then us laymen (or women) can handle, but I urge you to try to understand at least the basics. There are articles that articulate it very well.
What you are looking for by adding shrimp is for the shrimp to break down into ammonia. (You could alternately use liquid ammonia) the ammonia provides food for bacteria which convert ammonia into nitrite. The nitrite then provides food for another bacteria which converts nitrite into nitrate.
What you will see in your testing is an initial increase in ammonia, a decrease in ammonia, an increase in nitrite, decrease in nitrite, increase in nitrate.
Until your testing reads 0 ppm ammonia, 0 ppm nitrite, x ppm nitrate you're cycle isn't complete.
Furthermore you should test your cycle by adding a small amount of pure ammonia to your tank, enough to get maybe a 0.5-1.0 ppm reading, and verifying that the bacteria in your tank can convert the ammonia to nitrate in one day.
At that point do a water change and add one or two hardy fish. Clowns are a popular option, but it depends on your fish list.
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