Soe Ko I have made the same mistake when I got my first ED visa 😊 Tod is 100% correct. Your first 90 days report should be done approximately ~180 days after the date on your ED-visa. They will definitely give you the receipt with the TM47 date when you go for your first extension😊
I don't really want to discuss whether it is logical or not, to be honest😅
All I wish is that Thai embassies would publish the official list of all the documents they require so we can be prepared. The income docs weren't mentioned among the requirements for Soft Power route in Vietnam so it was not a very pleasant surprise.
I am also interested in this, and as far as my research shows - DTV won't work for _just_ language learning. Some schools are currently creating courses "Thai language and culture" which might be more suitable for Soft Power depending on an embassy. In this group, there were several reports (but definitely not many) of success with TSL Chiangmai (the name of the school), although I don't remember from what embassy. Search for 'TSL' in the group, and you might find more info.
My friend applied in Vietnam and she was asked to show her income docs (despite applying for Muay Thai and having bank statements). Luckily, she has been renting her house in another country so she was able to provide tax returns from that and got her DTV.
From my understanding, nowadays in Vietnam they have started to ask for income documents for Soft Power too.
If you go via soft power route, they might ask for your income source, and that's when you explain that you rent out your property. This is a reliable way of getting DTV in your situation.
Going a 'workation' route might work depending on the embassy, but it's not guaranteed.
Everything is fully booked😅 but sometimes people cancel their queues. Those openings appear in the system at midnight every day, so it might be worth checking. If you do, don't be late😅 set an alarm for 00:00, because many people are hunting down those time slots🙈
I did it twice, and it took me about 30 minutes, I think. You can't book this appointment in advance, but there is no real queue for that type of procedure either.
You need to cancel your visa/extension. For this, take a letter of cancellation from your school, go to Immigration and they will put a cancellation stamp in your passport with the date when you absolutely have to leave Thailand (the date in the school’s letter). This is free of charge.
You can leave earlier than that date but not later. After that date, you are free to apply for DTV as soon as you would like.
My school told me it's preferable to cancel the extension of stay (ED visa) before applying for DTV. For some reason, in my school they don't differentiate between the visa itself and the extension stamps. They always say it's more reliable to do the cancellation before applying for any other type of visa.