there is a site that is mentioned all the time for dummies tickets. In my case I always buy a cheap ticket to Vietnam. In five years no one is ever asked me for onward ticket and I have never carried more than taxi money but there is plenty of ATM near immigration if they really wanted. First trip before covid I asked immigration office where ATM so I could exchange some money for cab.
but coming from someone who claims he committed attemptted murder and robbery. Your a real pos. Maybe someone needs to investigate you for being in Thailand.