Greying out completed task and Redding incomplete task

Hello I was wondering if you can auto change the hue of tasks that are completed to dark grey since so much colors is overwhelming to people who are easily distracted. It also feels more satisfying to look at.

Also can you change the task color of any tasks outside the appointed schedule to red. Think of it as a guilt trip color for the brain to associate to complete the task. At this point the colors overwhelm me to an extent. Would be easier if there’s signal colors to focus on.