The first shortcut method is doing mindfulness practices, such as meditation, deep breathing exercises, etc, which can help to reduce stress and improve emotional regulation.
Expecting growth? Come out of your comfort zone and start trying new activities that can help you to build mental toughness. You should face your fears and challenges as well.
You already know that physical health is close to mental health. I suggest you start focusing on regular exercise in the morning, make a healthy diet, and adequate sleep is necessary.
Did you know? Positive self-talk can do wonder in mental toughness. If you are having a problem-solving attitude, you will never fail in building mental toughness.
My suggestion to you all is to take failure as an opportunity. Keep learning from them to grow in life. It is vital to take lessons from them.