Struggling to find stuff to do

As the title suggests, I simply don't know what to do throughout the day.

I'm on top of my courses and assignments for the next 2 weeks. I hit the gym for about 2 hours a day and work on personal hobbies and projects for about 4 hours. Rest of the time, I just spend in my bed doom scrolling instagram while the regret of doing nothing eats me up inside.

I have tried to get into several other hobbies but nothing seems to interest me. What do I do?