I am applying to immigrate to the United States under the A2 category. What should I do if I don’t have a guarantor? There is no way to buy tax.

What the poster said is a bit incorrect. It should mean that the main applicant's income is not enough and he needs a co-guarantor, but he can't find one.

It depends on how far your income is from the minimum income line. The shortfall can be made up with deposits (but it must be made up 5 times). Deposits in US dollars or RMB can be used. Even if you have stocks, houses or other valuable items, list them as well.

If it is still not enough, you can find relatives, friends, colleagues, classmates or even neighbors to help you be your guarantor (must be a US citizen or a green card). Find someone you don't know. If the consulate doesn't believe that person is willing to vouch for you, it will be a waste of money.