Those biological booster products like quick start might claim to cycle a tank but in reality the best you can hope for is to reduce the time to cycle a tank to weeks rather than months. They might not do anything, if the product isnt transported and stored in refrigerated conditions, the chances are anything beneficial will be killed off before you even get it home.
You can cycle tanks with no fish by dosing ammonia to artifically create waste and fuel the cycle. This is called a fishless cycle.
You have fish in there, so you need to undertake a fish in cycle. Test water daily, your target should be to keep ammonia + nitrite combined below 0.5ppm through water changes. Eventually you will consistently see ammonia + nitrite at 0ppm and your nitrate should be rising. This is when you are cycled for your current stock and you can add some more. This might mean daily water changes until your cycle starts to kick in depending on your parameters. It doesnt look like you have an ammonia test. You need that. Until you can test for ammonia a daily 25% water change should be enough to keep things in check until you confirm where you are.
Briefly, the nitrogen cycle is the process of bacteria breaking down waste in the form of ammonia, into nitrite, which is also harmful. Different bacteria then break down the nitrite into much less harmful nitrate. Your cycle normally cant process out nitrate, so you remove that with water changes. Cycling a tank is the process of growing the necessary bacteria, and as previous, it typically takes several weeks to grow enough to process out all the waste, even with products like quick start (assuming they actually work).
As nitrate is the end product of your cycle, the fact you are only seeing low levels is a clear sign of your tank not being cycled.