Borrow money from your dad, have the money in your account for 2 statements and apply with 3-6 months bank statements, any income you earn, a cover letter (explaining your financial position, why you want to be in Thailand, that you won’t work in Thailand etc). Then get a sponsorship letter from your dad saying he’ll cover any of your financial needs and 3 months of his bank statements.

My partner had the money for 2.5months and I wrote him a letter. Our application in Hanoi:

One person just posted she applied in Jakarta she had the funds only in 2 statements and was approved. Search the group about this. If you can demonstrate a strong position it’s not mandatory for exactly 3 months