@Joe ******
My daughter (21), a Thai national, her first language was Thai, left Thai as 4.5 years old. A student now in Australia. Raised in Japan, International School, English spoken at home.
She took so far 400 lessons from a professional Thai teacher (15 US$ an hour, online), reading, writing, speaking.
She can barely make a phone call from overseas to Thai.
Stick with yur English.