“Cue” typically refers to a signal that encourages someone to take action. If you “cue” the confetti, it means that you then the action. Maybe you find some confetti and toss it in the air in celebration.
The word “confetti” might instead be a symbolic suggestion that what you are going to toss around will, for example, compliments or kindness and that your efforts will cover everything.
In this case, saying “cue the confetti” might be a reminder or even a directive that your action should be like confetti falling all over, helping you to celebrate.
Spreading kindness around, like it is confetti, may be the result of first just wanting to make someone or the people in your life feel good. Kindness is contagious and may then spread everywhere around you, and it will be like confetti falling.
When a person’s efforts are spread to others, connections follow. Perhaps too little effort leaves connections not mattering? Or with ENOUGH EFFORT CONNECTIONS MATTER!