What are the long-term visa options for living in Thailand without a job?

You can apply for Elite Visa. If interested, can use my agent.

If you're happy with your salary in China, stay there. Economic here in Thailand is bad.

If the LTR visa is not suitable for you then your only real option that allows you to work is to set up a Thai company, employ 4 Thais and get a Non-B visa on the back of this. Or get a job teaching English if you have a bachelor's degree which will also get you a Non-B visa. Other than that your options are limited to ones that don't allow you to work such as the elite visa

You could start off by applying for the LTR visa and use a BOI company for your Import/Export business…

you can only work on the LTR visa since its not a Tourist visa like the 60 day SETV/6 Mont METV you can also not work on the Medical Visa or the Ed Visa, plus there are other visas you are not allowed to work on.

If you are legally recognized resident of China then you can apply for the 6 Month METV, with strategic border runs you can get 9 months out of the visa… if you are not a legally recognized resident of china you will have to travel to your passport countyr(s) or permanent resident country to apply for the visa…

you can also purchase a 60 day SETV visa for ฿1,900 in China then extend it for 30 days for ฿1,900 at your local immigration office… but this is a single entry visa so once you depart its basically null and void

You can do 2 land border crossing per calendar year (01 JAN - 31 DEC) then with a 30 day extensions at your local immigration office for a cost of 1,900THB you can get 60 days in Country

There is no official limit on the amount of Fly Ins one can do, however you will eventually be questioned by an overzealous Immigration officer

Or you can take the job in Bangkok get the Work Visa then plan your next move

Good luck

Jump over to Laos, I have friends who are still living there since COVID 😷 started. Highly recommend Luangprabang it’s nicer than Chaingmai…..imo