What options do I have to extend my stay in Thailand beyond my current visa expiration date?

After entering Thailand with a 45-day visa on arrival, which you plan to extend for another 30 days in Chiang Mai, you'll need to consider your options for staying longer than the total of 75 days. You can only extend your initial entry for a maximum of 30 days once. To stay beyond January 14, you'll need to do a border run to obtain a new stamp, where you can either cross into a neighboring country like Malaysia or Cambodia and return, which may give you another 45-day visa. Alternatively, joining a visa run service can facilitate the process for you.