Is there any future in doing SEM?

It’s not that there is no future, SEM, like SEO, is a method that can regularly operate rankings. If you only know SEM and don’t think about making progress, there will be no future, because now SEM’s The difficulty of entry has been decreasing. In the future, you may not need a full-time person to do SEM. Maybe Baidu can operate it yourself, so you must have your own irreplaceable technology to survive.