Passion
Feeling withoug passion is normal, we have all been there. What has helped me through those times are these points:
1. I have friends who can help my find something to be passionate about every day
2. I find enjoyment in doing things for others, so on days or periods of time where I don't know what I want to do, I do that (also how you get #1 above)
3. Oddly enough, exercise helps me be more awake and active
4. Do things with others, this is a little like number one but the point of this is to find people who will hold you accountable (this is not good in all situations, if you don't like it and it has no purpose, don't do this) but I have a chemistry podcast that I record with a friend of mine every weekend, I can't just decide not to do it, there is another person.
5. FIND SOMETHING YOU WANT TO FIX OR HELP this can be your passion on it's own, find something that makes you angry, or sad, or passionate, something that is going to make you want to get up every morning becuase this cause can be fixed and you want to do it.
6. Understand that you may be going through a time where you just feel less passionate, we expect progress to be linear, but in reality it has plateaus. You have to work through these but don't get too angry at yourself if you are a little slower than usual.
7. Set goals. Goals have helped me in so many ways, you don't always reach them, but goals will help you accomplish more.
8. Play an instrument. It helps me to play an instrument if I feel less passionate, and I usually feel better after, and if not, at least I have accomplished practicing and I usually don't feel like I am making myself practice. I recomend playing an instrument if you don't, I play the flute and violin and they are both amazing instruments.
9. Little rewards. You might have a hard time working towards something large, but if you give yourself some small rewards along the way, or intentionally choose something that not only helps you reach an overall goal, but helps you gain things every step of the way (if that makes sense) then you might find it easier to do something.
10. Most of these will only work if you have time. If you are stressed and studying or working too much, then you need to fix that. Everyone needs free time in their life, and too much or too little can lead to stress or boredom.
11. Reading. When all else fails, reading or sometimes playing a game help me get engaged in life.
I hope this helped, and I hope you find something to be passionate about!