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If your plants are babies, then it's normal for them not to bloom. Many hibiscus like to be 3-4 feet tall before they start to bloom, and a few varieties are very slow to start blooming. If your hibiscus is young and has not yet bloomed, then don't worry. It is expending its energy on growing leaves instead of producing flowers. When it feels strong, big, and healthy enough, it will start blooming.
There are three main things that hibiscus need in order to make buds: the right amount of sun, enough water, and enough of the right kind of fertilizer. So if your hibiscus aren't making any buds at this time of year, look at each of these three possibilities.
It's midsummer, the peak of the season for a nearly invisible little flying insect called thrips. These annoying little pests fly off of many, many different flowering plants and weeds, and lay their eggs in our lovely, developing hibiscus buds. Sadly, the eggs hatch and the larvae kill the bud before it finishes developing, with the result that we see fallen buds all over the ground and no flowers.

https://www.gardeningknowhow.com/ornamental/flowers/hibiscus/how-to-care-for-hibiscus-plants.htm