How can I renew my expired Thai driving license, and who can I contact for help?

You can renew if up to a year expired.

As per other comments, you need a residency letter from Immigration (within a month of applying), a medical certificate (within a week of applying) and a print out of successful completion of the online tests (done within a month of applying). All of these are pretty standard reqs everywhere though the validity periods may vary from office to office (I did mine in Samui).

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If it is less than one year expired then you can renew. You need your passport with copy of bio page, entry stamp and visa plus a certificate of residence from immigration to confirm your current address. You will also need a medical certificate which you can obtain from any clinic. Many offices now work on an online appointment system so check out if you need an appointment or not. If you don't need an appointment then I suggest you go there in the afternoon as it is usually more quiet. Thai culture is to go the government offices as early as possible.

Go in with a Thai person and get the translation sorted. So long as your license isn’t expired more than 12 months, you have yellow book, address hasn’t changed and health. Clearance from the medicine shop (100thb) .. sounds like there might be some confusion about your current address not matching yellow book?

One year grace is applied.

Can do online. Get the required paperwork. Doctors cert. etc. get on the smart Q system. Do the test online. Takes 1 hour. Video. Answer the questions at the end.

Then take all your paperwork to the transport office in your province ! On the date you have booked online!

Mine expired covid I had to do the full test couldn't renew, the test itself is so easy its hard. Top tip practice driving on a 20 meter long, 3 inch wide plank, without putting your feet down 😀

How long has it been expired for?

Take a look here:

Assuming that it has expired unlikely you will be able to renew it

Mine expired a couple of years ago and I had to start the process over again from the beginning including doing the written and practical test again