If App Exposé is selected in Trackpad preferences, you can also swipe down with three fingers. Steps as above, but instead of steps 2 and 3 ( Cmd + tab and arrow keys):
Open the selected item, or open a dialog to select a file to open. You can view a list of keyboard shortcuts by pressing, (Mac) and Ctrl, (Windows/Linux) from Slack. This will bring up a list of all the application's windows (You can release key command key once the window list view comes up if you like) You could use Keyboard Maestro to move the mouse around and click on the right place. Had to click on the green button to get the windowed screen back.
To restore one of many minimized windows using only the keyboard, you have two choices: