No extracurriculars/GPA lowered

I have two questions for this amazing community.

#1. As is often asked in this online community, I have extracurricular troubles. All I have for extracurriculars is:

My hobbies

The time I volunteered a couple times

I entered some art contests (I won second place a couple years ago)

I plan on getting a part-time job this summer and I've also applied to a Pre-College program, though I may not be accepted on either of those options. I need options that doesn't involve me much paying money. I don't have many options because of either my strengths (or lack thereof) or my location and current lifestyle.

#2. I took two dual enrollment classes last semester, and am taking three more right now. However, I got a B in one of those classes and it lowered my GPA from a 4.00 to a (weighted) 3.9, (unweighted) 3.75 I think. Now I'm panicking over the fact that I'm depending 100% on my GPA and my academics to get me into college, especially since I might not be able to take the SAT or ACT. I was looking into AP's, but I'm homeschooled and there doesn't seem to be online options. What should I do? This is another reason I wanted to get more extracurriculars under my belt, to compensate for the lowered GPA. Also, I apply to my top two college choices at the end of this upcoming summer, which doesn't give me much time.

What do I do? How should I keep my GPA from going even further down? Is there online AP options? What extracurriculars should I look into?

Thanks for reading all of that. :)

And thank you in advance to those who will answer.