Not asking for advice but giving information which I hope may of use/interest. I am a 61 yr old retiree from UK. Last winter I spent 3 months based in Bangkok Airbnb using visa exemptions. Did trips to Hanoi and Singapore so was in Thailand for 3 stays of approx 30 days and no problems at all. This year doing same and after second trip out was asked to show return flight which I did. Was then told "you did this last year, what you are doing is living in Thailand, if you come next year get a visa"

I have read they have tightened up on people using visa exemption, particularly people repeatedly staying 60+30 days extension then leaving for a short time. I know entry is never guaranteed and because I am staying less than 90 days in a 6 month period I had hoped I wouldn't need a visa but it seems rules are getting tighter all the time.