Nina was trying to try her luck in the Ellora ruins. Utopias held many secrets within them. In the separate dimensions setup by Sage rankers, there were several ways for rankers to resume their ranking journey, bypassing their bottleneck. If they were lucky or talented enough to acquire them.
Nina wasn't behind her ranking journey in any way. It was just that progressing in the B-Rank was an extremely challenging and time-consuming process. It would make the ranker feel that they were not progressing in their ranks at all.
Forced breakthroughs were spontaneous. They didn't have normal limitations that would be placed on the ranker if they only limited themselves to practising ranking techniques. She believed that she should try her luck at forced breakthroughs instead of just following the standard routine.
Your gift is the motivation for my creation. Give me more motivation!