You can go to Nha Trang ( beach resort city), or Da Lat ( Highland french vibe city), only 8 hour bus ride or less than 1 hour flight from HCM. I personally can't stay in HCM over a week, too much pollution and traffic.
My husband is also Upwork freelance. He applied with Upwork earning certificate, picture of his profile and client reviews, tax return, 6 months saving account ( only the last 2 months were over 500k bath).