First I would like to thank everyone in this group for sharing valuable information. I just want to say that Mae Sai border is open again, I got 45 days. There is an option to stay 14 days in Myanmar in the area of Tachileik. Have a good day everyone.
TLDR : Answer Summary
The Mae Sai border crossing to Myanmar has reopened, allowing travelers to obtain a 45-day stay. Options to stay for 14 days in Myanmar are available in Tachileik and Kengtung. Travelers should check if a visa for Burma is needed beforehand or if it can be obtained at the Mae Sai border.