What are the best visa options for staying in Thailand longer than 12 months with a Non Immigrant type B visa?

For the 60 day extension of stay based on unable to travel due to COVID-19, you will need:

1. Your passport and:

a. a copy of your data ("picture") page

b. a copy of your most recent visa (if you have one)

c. a copy of your most recent stamp

d. a copy of your departure card

2. A TM30, filed in the immigration office.

3. The forms (each immigration office may have different forms, and want to use their special forms)

4. A letter from your embassy saying you can not return, OR a print out from your embassy website saying they don’t issue the letters, OR a print out of a letter from the embassy saying they don't issue those letters.

5. 2x passport pictures

6. 1,900 THB.

You will need to cancel your existing extension of stay first.

Ask the local immigration office what their requirements are.