You can leave it as a clump of plants or divide it into several plants if you wish. However, the best time to divide a group of plants is in late spring or early summer. I would leave it be for a while and allow it to fill the pot fully.
For best growth and flowering, bird-of-paradise requires plenty of water during the growing season and moderate levels of fertilization. The Peter's fertilizer you used is fine. Just don't fertilize too much or the plant will tend to grow vegetatively rather than flowering its best.
Make sure it gets plenty of light, at least 4-6 hours of bright sun a day. In dense shade it may not bloom well. It should start to bloom better after it has a season or two to settle in and especially after it fills the container and become a little more rootbound.
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