We need to remember that mental health did not begin with COVID. The things that worked for you before as a parent, teacher or community member are really important to put at the forefront now. Watch for a young person's change in behaviour. More isolation, distress or even overamplification of cheerfulness could be an indicator.
My best advice—it's Kathy Hay advice, not professional advice—is to be actively involved with your young person or a young person in your life. Watch what's going on. Don't assume everything is okay, because if you're feeling the stress of COVID, which we all are, I can assure you that young people are feeling it even more.
If I could put one final note forward, I would ask people in communities to please watch out for young people, because abuse is increasing. Kids are in homes that might not necessarily have been safe before, but they would have received support in their schools or community environments, which aren't available to them now. Keep your eyes open. Kids Help Phone does mandatory reports every day, and we work with young people and parents in those environments.