If returning to new address you need new TM30. If returning to same address at which you previously filed a TM30 no need. During your extension of stay process a new TM30 will be filed anyway.
your visa validity date starts counting down the day it is issued. You have until Nov 13th 2026 to enter Thailand. Every entry will give you a 1 year permitted to stay stamp or until the date your health insurance expires. With planning you can get almost two years out of this visa.