Is there an easy method to changing my existing DC-V721W to 24/7 monitoring?
In general 24/7 recording through Alarm.com is available via the SVR or Onboard SD card recording, however the 721W is not compatible with onboard SD recording.
There is no cloud 24/7 recording option. A plan supporting SVR would be needed along with the physical SVR. The residential model was discontinued in favor of onboard storage for newer cameras.
The CSVR126 is still an option. You can adjust your plan to Complete or Protect to include SVR support in the system manager here.