First off, take a look here and here.

There's tons of things to consider, even assuming I have a tireless work ethic and can implement this immediately.

This is the first thing that jumped out at me. I would recommend the Confidence Spiral approach, where you set small goals you can reach and use that to gradually ramp up your projects. Measure what you do in terms of improvements over default, rather than subtractions from perfect. For example, I'm going to recommend a bunch of books and blog posts in the remainder of this comment. You could read them all at once and try to apply them all at once- but it's better to read a book, attempt to apply it, then read it again in a month or year later with your new knowledge of having tried to apply it. Once your attempts to apply the first book are in place (but before you do the review), then start the second book.

what would you recommend that I do over the next year, to give me the biggest utility bonus the fastest, both in intelligence and wealth?

There are three parts here.

Utility bonus: Being happy is a skill. Read How to be Happy, Scott Adam's Happiness Engineering, and a book on cognitive behavior therapy, either feeling good or a workbook targeted at anything you want to be better at. (Effective therapy teaches people interpersonal and intrapersonal skills whose lack are generally at the root of their problems. Even if you don't have any problems at the clinical level it's useful to use the skills to make yourself better than default, to make developing those problems less likely, and to be able to give solid advice to other people who do have problems at the clinical level.)

Intelligence: Your maximum intelligence is pretty much fixed at this point. You have two options open: be at a higher fraction of your maximum intelligence more often, and skill growth. You're already here, so I won't mention rationality besides to mention that my current favorite book on decision science is Decisive.

The first is done mostly by clean living- eat well, get plenty of sleep, and minimize cognitive load by moving obligations out of your memory into external storage. If you want to do this rigorously, use Quantified Mind to track the effects of interventions, but for most interventions the problem is not knowing whether or not they're working, but putting in the effort to sustain the intervention. Your high school that starts at a terrible time- actively develop the skill of going to sleep early to get a full 9 hours of rest. Melatonin might help. Getting Things Done is the book that details how to use todo lists and external memory to reduce cognitive load, but it won't be that important for you. Use Anki to memorize things you need to know for school, as well as things that you come across that you want your system 2 to have available.

Skill growth comes not from demonstrating what you can do but learning what you can't yet do well. This means that practice needs to be deliberate to be effective, and will often be effortful. (That doesn't mean it won't be fun- but make sure you're consistently challenged, and not avoiding areas where your skills are lacking.) Here, read So Good They Can't Ignore You,

Wealth: The standard way these days for clever young people to earn extra cash is by providing basic technical services to people in their social circle or their parent's social circle that don't know where to look for professional technical services. This will be stuff like website design, computer repair, putting things on eBay, and so on. I haven't seriously investigated this in a long time, and so this could be out of date.

Long term, your wealth will in large part depend on your social skills. Read How To Win Friends and Influence People, Getting to Yes and possibly Never Eat Alone (the name is a good tip, but the book contains much more). Get to know people in positions of influence, and try to make it as pleasant for them to be around you.

You should put this in the open thread. I didn't downvote this, but don't want Discussion be cluttered with "here are some superficial facts about me, now please optimize my life"-type posts.