Sorry, but you clearly have no idea what it's like to actually deal with this, at all. If I try to be on time to things, I will be stupidly early, or still think I have time to do tasks A & B before doing C, because they invariably take more or less time than I estimate. Or I start doing tasks X & Y, because I'm easily distracted, you know because it's a deficit in attention. Don't trivialise what you don't understand.
Your advice is as ignorant as saying 'just do more fun things' to someone with depression.
Your advice is as ignorant as saying 'just do more fun things' to someone with depression.