Nepalese citizens of SAARC countries have 30 days in landing visa, but China is not SAARC. . . The original text is as follows:
National visa of SAARC countries:
For the first time, nationals of South Asian Association for Regional Cooperation countries other than India will get visas for up to 30 days free of charge within one year.
Although the Nepalese Consulate in China indicated that China would be granted a 30-day visa on arrival, you did not enter Nepal from China this time, but from India, so you may not be able to apply for a visa on arrival.
In addition, I saw it at the Nepalese consulate in India, where I can apply for a new visa before it expires. The original text is as follows: nationals of other countries can apply for visas at any Nepalese embassy abroad. Visas can also be obtained from entry points in Nepal.
The price of 15, 30 and 90 days is $25, $40 and 100 respectively.