I would say, try to see world from others eye. eg. If door nob is to low -> for children, Fonts too big--> For elderly, Website so dumb --> for accessibility reasons etc.

Change your perspective, Always ask why to your self like If you find something dumb and also in abundance, there must be reason why it is still being used. Walk in others shoes, make your product/daily decisions thinking the same way. It will not just work first time, Every day do meditation for 15-20 minutes and think for what you saw last day and repeat, you will have your answers. May be you get new business idea doing so ;). That would be the best way to handle it in my opinion.