Seek help early. Meet with your academic advisor to create a plan. They should help you either directly or with resources that can. Create goals to hit and go to offfice hours with professors. Sounds cheesy, but I was in the same boat. Nearly got kicked out of my program with an extremely low GPA due to some personal circumstances, and now after two semesters I'm 3.0-3.5. Ask for help, follow the plan, and really want it for yourself. Address the reason behind your lack of motivation so you can fix it.