As much as Dante wanted to stay here, and as much as Beatrice wanted him to stay, he had to leave eventually. No banquet can last forever, and they both had tasks to achieve.
Still, knowing that they now had each other to rely on and fall back on in this cold universe, they were doubly motivated and felt endless strength surging into them.
Dante chose to enter the True Martial World immediately. As Beatrice said, his pursuit of Supercoins was a waste of time right now. He would not be able to earn enough to give him sufficient time in the Black Land to increase his superpower.
As such, it was just better to wait for the remaining 28 days to pass until he could enter the Black Land again. Right now, it was best to maximize his time in this world, so the Rising Star World was resolutely abandoned by him.
In the future, when he was more free or there was a necessary purpose, he could play with it.
