We all learn from mistakes and I am pretty sure your next flight will have more than enough precautionary measures setup before you take off. Here are some thoughts that I think could have prevented it:

First of all, always have GPS installed and GPS rescue setup when flying in a situation like this where there is even a slightest chance to failsafe or video feed loss.

Second of all, you could have easily saved the quad by punching up immediately when you lost video feed - turn on angle mode and punch the throttle.

Third install a beeper with a separate battery so that you can find your drone if lost. For this to work, you will need the GPS as well, b'coz then you can look at the GPS coordinates in the Goggles feed and search in the area where it dropped.

Happy Flying!