Seeking expert advice here:

a) Looking to apply for STV (is this the best option for long term 90 days stay? since.. 1) I'm not looking to marry, 2) I'm just working hybrid and would like to travel more of Thailand as I work)

b) Plan to arrive in Thailand 6 September, travel to Siem Reap 10-14 Sep, come back to Thailand. Question: Does this "reset" my 90 day stay or how does it work?

Does the 90 day means I shouldn't exit Thailand?

c) Read up on the STV requirements and it seems I need a Thai insurance, as well as one from my home country. AND a medical declaration endorsed by a doctor to show I'm disease free. All adds up to $$. This is all necessary right?

Thank you all, I just spent 30 Days here on Visa-Exempt, heading home Monday and planning to apply for the visa back at the embassy.