Hello, -- I have a quick message for you in the form of a video. If you have ever had trouble with a stiff, tight or "depressed" tongue, try this quick, easy exercise to loosen it up.
(See Video here.)Tongues can be troublesome for singers. Some say that the tongue is their major source of frustration. Sometimes the tongue pushes down too much on the larynx. Sometimes it rides too high and pulls the larynx higher than the notes or vocal tone requires. There is no fixed place for a tongue. It just needs to do it's correct job in the context of the phrase, and not produce the wrong kind of tension.
With this exercise
(you will see in the video), don't overdo! Run your tongue around your mouth 4 or 5 times one way, then do it the other way. Then rest and smile! Genuine, happy smiling is very good for your singing.