Be really grumpy!Keep track of the things that annoy you. This is a great place to start, as you know the problem intimately as well as being the first customer for any solution。
Listen to your clients, customers and readers.Complaints are a great source of insight as it’s a very quick way to find something that needs a solution. So identify the common problems that your customers are experiencing and consider possible solutions to their troubles。
grumpy adj.脾气坏的; 性情粗暴的; 脾气暴躁的; 性情乖戾的;
She understands why I get tired and grumpy.
Don't be so grumpy and cynical about it.
The grumpy man found fault with everything.