Here are a few possible reasons why she wasn't on later seasons:
* Career progression: Shakti Mohan's career as a dancer and choreographer was rapidly growing after Dil Dosti Dance. She went on to participate in other reality shows like "Jhalak Dikhhla Jaa" and "Dance Plus," becoming a well-known figure in the dance industry.
* Show format: As the show progressed, the focus may have shifted away from featuring past contestants and towards showcasing new talent.
* Personal commitments: Shakti might have been occupied with other projects and commitments that prevented her from being part of the show.
While she's not a permanent cast member, Shakti Mohan remains a prominent figure in the Indian dance scene and her participation in Dil Dosti Dance remains a significant part of her journey.