Hey there! I'm sorry you're struggling with college so much. It can be difficult if you have a lot of different obligations, like you do.
I would suggest going part-time. Even if you can take one class a semester, then that's perfectly fine! You're right. Not everyone has an easy time in college and that's okay, but I would still give it one more shot. If you have to take a break, do so. You're going through a lot (I'm very sorry about your loss) and you might just need a break.
I wish you all the very best.