OP, think you have asked this previously
https://aseannow.com/topic/1102143-an-idiots-guide-to-the-retirement-extension-process-at-samui-immigration-office/?do=findComment&comment=17396668
In any event Samui is up to 30 days early.
Note that Samui is bit strange and you may be told to come back closer to your until date.
Regards obtaining more than 30 days early this maybe possible.
Helps if you have eg a flight ticket and "story" of why you need the extension early.