you are fine. If you want to eliminate your concerns then keep cash on you when entering. 20.000 baht each they wont ask for it but then you definitely meet ALL the criterias. Enjoy the trip!
Be aware though: immigration CAN require you to (on arrival) to present the full plan of stay with confirmed bookings. But if you dont have a lot questionable travel history to Thailand they will not ask for that.
Immigration may ask for return ticket. But more likely the airline will ask for it or they CAN deny you boarding. I know quatar have asked me the last 4 trips.
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