B+ math grade in sophomore year (hear me out pls)

Before reading, please know that I'm not at all trying to ragebait or be an insufferable perfectionist. I genuinely just want some second opinions about my situation.

I just finished my first sophomore semester of high school with a B+ in Algebra 2 honors. I know it's not inherently bad, but my high school is very competitive (California) and people tend to be quite math-smart around here. Math is the only subject I have been getting Bs in. In freshman year geometry honors I had one B+ but made it an A- second semester, thankfully. But with this new B+ I feel like my GPA will continue to drop, especially since the math is going to get harder and I need to take AP Calc. I studied and practiced really hard for the MULTIPLE CHOICE math final, but I ended up getting an 80%. My retake for one test was also not to my expectations.

I just feel like I lost a bunch of opportunities to end the year with at least an A-. I want to go to a good UC school at least, to major in biology or biochemistry. If my graduating class weren't so competitive, I wouldn't be worried. This year, my classmates are taking APs or even harder math courses. I'm not taking any APs, only three honors. If I'm already slacking off sophomore year and getting a mid grade in a class freshmans are also taking, will it significantly reduce my competitiveness in college apps? Especially in a world with perfect GPAs... I also understand that proficiency in math is crucial for science majors.

With that said, to make up for not taking the hardest classes sophomore year, I feel like I need to take precalc over the summer so I can do AP Calc AB junior year, and AP stats senior. I will take AP Chem junior year as well, and I'm also debating whether to take APUSH or not. I'm afraid I will burn out, as my endurance and efficiency is much worse than all my classmates, though I don't procrastinate. I feel like I'm not reaching even the bare educational minimum of what my class is doing, and that I'm falling behind. What should my strategy be to survive the rest of high school, and build my scientific passion without the mathematical deficiency?

(I'm involved in several extracurriculars in case you wondered)