@Axl *****
have proof you're going back to YOUR country in a month if you're comin' in on a free entry stamp. have proof of 20K baht or the equivalent in CASH, and have proof of where you're staying here
That's what they will ask for if they're going to deny you entry or give you a hard time.
You would have been way better off to bounce out and back by land with a service that takes you to the border and back, rather than flying in but good luck with it. Be prepared to be questioned about why you're still here π