Only Thai immigration can cancel your visa. The fact your old passport has been cancelled simply means it cannot be used for travel but it can be used to gain entry to a country and you have a valid visa. The only trouble is does the IO know this

It needs to legalised before you get a yellow house book and pink ID card

The TM6 card was suspended about 2 years ago except for land border entries. However, they plan to launch an online registration for visa- exempt entries. They've postponed it once. Also, the visa-exempt entry is for 60 days not 2 months so don't mess up your return flight or it will cost you 1900 baht for an extention

You came in visa-exempt free for 60 days. US citizens cannot get a visa at the airport. You can get a visa on arrival at the Cambodian border and it costs 30 USD cash. There is a cash machine at the border if you don't have cash. The visa takes up a whole page of your passport. Unless you have had many visa-exempt entries recently then coming back will not be a problem. You will get a new 60 free entry stamp. Cambodia is lovely. It reminds me of Thailand 20 years ago. They accept dollars everywhere but you get your change in local currency which is worthless outside the country so use small $ bills.

There are specialist DTV groups on FB where ppl have actually got the visas so ask your question on there.

You are better asking in this group

I asked a long-haul air steward how she coped with jetlag and her answer was to immediately move on to the time zone you are travelling to as soon as you get to the airport. If possible deprive yourself of sleep so you can sleep easily on the plane at the correct time. I've followed this advice and I time adjust within 48 hours. The worst thing you can do is to have a sleep when you arrive if it is still daytime and don't keep an I on the time back home.

The online non imm O e-visa is pretty easy and as you already have seasoned funds there is no reason to consider any other type of visa. I expect your current METV will just be cancelled when you are granted a Non O. Your Non O will be for 90 days and you can apply for the retirement extension up to 30 days before it expires. You must be able to show the funds came from abroad. On the non O application they ask for proof of residency in your home country so just upload your DL or your passport again as both are accepted

@Chris ********

was that the airline or immigration who asked?

You get 60 days free visa-exempt