Before you store mince in the freezer, divide it into useful portions and flatten each one as much as possible. That makes the mince faster to freeze and faster to thaw.
The One Pot Chef makes this point in the video above. You don't need to use any equipment to flatten the meat; simply push down with your fingers, then seal the bag. Flattened meat freezes and thaws much faster because it's exposing a larger surface area -- think of it as a sheet of ice versus a block of ice.
Quick Tips: Meat Freezing Tips [The One Pot Chef]