Thanks for the beautiful pictures. You live in Thailand?? I grew a mexican paypaya from seed many years ago. In a large pot. We are in Michigan. I’d bring it in the house for fall and winter and then put it out in the spring. It got about 6’ tall, did flower but no fruit. Only one around. I wound up donating it to the local botanic gardens.
Yes, in a small beach town about 150 miles southwest of Bangkok. Retired here about a year ago.
I've never heard of anybody who's gotten a papaya to fruit outside of the tropical zone, but the foliage is pretty anyway.
I would think for it to be a successful effort, you'd almost need to have a tropical conservatory at that high a latitude. Proper heat year round, proper humidity, and about 10 hours of strong sun every day at a minimum.