have a place to stay, a return ticket and a reason why you come so much. Do you have a job in your home country? Do you have a business card and maybe a paystub as proof or company email they can test right away. They send an email and you receive right there.
Did immigration tell you that you wont let back in? What is your passport country Before i got my DTV i would come 10times a year and spend between 7-30 days. Just depends on my work schedule. Immigration never said a word to me about it. I have a US passport. Not a beg packer
I would use DTV. If you want to enroll in a school muay thai or cooking or both. I have a DTV for remote work. Good for 5 years. Leave country every 180 days. For a couple days. Easiest to get and zero hassels.
Honestly no need for a thai bank account. You can get a sim card use your US bank. Get a Wise card Make sure you have a couple ATM cards, if a machine eats your card you still have access to money.
To scout more countries you can use your 180 day break for that or your time resets when you leave.