Is there any way to get a green card for going to the United States with a B2 tourist visa? Besides asylum?

There is no way to get a green card. B2 is that a tourist visa can stay in the United States for up to 6 months, and can make multiple trips within one year. You can apply to the US Immigration Bureau for extension at the expiration.

American tourist visa (B-2 visa): B-2 visa is issued to applicants who travel to the United States, including: 1. visiting relatives and friends; 2. Tourism; 3. seek medical attention; 4. Deal with emergencies, casualties of relatives, property disputes, etc. 5. Attend children's graduation ceremony or wedding; 6. Participate in various kinds of community activities; 7. Participate in various amateur concerts and sports meetings. B2 visa holders cannot work in the United States.