Do I need to do anything else besides updating my address with a new TM30 before my 90-day reporting deadline in Thailand?

Updating your address with a new TM30 is important, but it does not replace the need to file your 90-day report on the same timeline as before. It's the landlord's responsibility to handle the TM30 update, but ensure that you complete your 90-day report as scheduled unless you've left the country and returned.