The decrease in active COVID-19 cases in India can be attributed to several factors:

• Vaccination drive: India has been ramping up its vaccination drive, which has resulted in a significant reduction in active cases. As of September 2021, more than 75% of the eligible population has been administered at least one dose of the vaccine.
• Improved medical infrastructure: The government has increased the number of hospital beds, oxygen supply, and medical facilities, ensuring better care for patients. This has led to a decrease in the number of deaths.
• Adoption of COVID-appropriate behavior: People are more aware and cautious about taking precautions such as wearing masks, maintaining social distance, and washing hands regularly. This has led to a decrease in the transmission rate of the virus.
• Effective lockdowns and containment strategies: The government has implemented strict lockdowns in areas with high infection rates and imposed containment zones. This has helped control the spread of the virus.

Overall, a combination of measures such as vaccination, improved medical infrastructure, COVID-appropriate behavior, and effective lockdowns have resulted in a decrease in active COVID-19 cases in India.