Decreasing demand and price of Fingerroot in Thailand

In late October 2021, Fresh fingerroot wholesale price bounced back to almost the same price as before mid-July 2021, when the trend of drinking Fingerroot juice to prevent Covid-19 started.
Since then, the price has increased 3 times higher than the original wholesale price (from USD 1.5 per kg up to USD 4.6 per kg), however it bounced back to the previous level (USD 1.9 USD per kg). The supply is sufficient enough to meet diminished demand due to the increasing rate of vaccination in the country.