not many ppl realized the 65k method most are too happy to go tru the 90days and 1st year extension....like myself i miss a few mths for my 2nd extension I can only do it at my 3rd extension....after confirming from the immigration officer....it's a taunting process for me as i started from scratch without agent luckily I had a thai bank acct few years back which I use for the convenience of travel not planning for retirement at that time
are u coming in on a nonO visa or visa exempt? If coming in on nonO yes a one way ticket will be enough and once in thailand u can start preparing for the 1yr extensions but if u are coming in on a visa exempt (60days for 93 countries) it's best to have a return or outbound ticket
Using a agent is up to individuals no one can foresee how the immigration will act in a few years time....if u do already have a rhai bank acct I would say keep it alive and don't close the acct and keep the thai sim.....during covid I have kept both my thai bank acct and thai sim and it does make it easier for me when thailand reopens it's door