Why was there no eleventh human guru?

There was no eleventh human guru in Sikhism because Guru Gobind Singh, the tenth guru, declared the Guru Granth Sahib, the holy scripture, as the eternal Guru. He emphasized that the teachings and wisdom contained in the scripture would guide Sikhs forever. This decision marked the transition from human Gurus to the Guru Granth Sahib as the spiritual authority for Sikhs, ensuring that the faith would be based on written teachings rather than the lineage of human leaders.