In my experience most very strong students at some point run into a wall, where they get to a class that they find very difficult. Since we have never had a hard class before, it can take some time to learn how to handle this. This is something that it is good to learn in high school, since it will happen again for nearly any student when they get to university.
I am not all that concerned about your getting one F. The thing that concerns me is that it is in Algebra 2. Algebra is too core to too much that you are going to need to do in the future. I think that you at a minimum need a tutor for this. If you take this on-line over the summer, then you will need to also have a good tutor at the same time. Note that “good tutor” largely means one that you mesh with well. Any good math tutor will know algebra very well.
The next time that you run into a hard class, you need to seek out extra help early. Do not wait until the week before the final. The second or third week of the course would be a good time to see the teacher for extra help or to sign up to see a tutor on a regular basis. If you are pretty sure that a class will be tough, you might want to arrange a tutor before the class even starts. Given your experience with algebra 2, you might want to do this for whatever math class you take next year.
Also, in the future if school gets tough, you need to think about what else you can drop in life. Academics needs to take precedence over ECs.
This might not seem like it right now, but this may help you to understand what to do and how to approach it when you run into hard courses when you are in university.