Answer :Buddhism appealed to people of lower castes because it emphasized individuals' path to enlightenment and salvation, which could be attained in this life. Buddhism also received state support from Emperor Ashoka, who converted to Buddhism in 260 BCE (do not copy and paste this, it is from the internet).
Step-by-step explanation:
The caste system was harsh on lower castes who practiced Hinduism, and restricted choice (due to how it regulated what jobs and occupations could be taken by a person based on caste) as well as how it vastly changed your role in society, and Buddhism offered a form of Equal salvation that many members of lower castes were drawn to. The Mauryan Empire also converted to Buddhism under emperor Ashoka, ushering in a new age of Buddhism and the continued existence of it in the Indian subcontinent.