I'm very sorry to hear how the cycle is shaking out for you. I can only imagine how you might feel. While there is still time for more interviews before March, I do think it's fair to start thinking about reapplying if it comes down to that.
Instead of indiscriminately taking more tests (you have already proven you can), I would apply more broadly. I had a lot of surprises this cycle having had applied to 52 schools and being rejected from most of them, including my state schools and a number of lower-tier/low-yield schools I considered baseline/safeties. Mind you, I was admitted to an Ivy, it's not like I had no business applying—it's just that random from our perspective as applicants. Nobody really knows where their profile will resonate, so you've got to assume each school is a lottery ticket.
I won't lie to you, it was expensive (and I qualified for FAP), laborious (assuming an average of ~5 secondary essays per school, you can imagine how painful it was), and needless to say, emotionally taxing. Putting SO much effort into a process I had zero guarantees would pan out (and appeared highly unlikely at the time) was borderline impossible to motivate myself to do, but I knew that it was my best shot statistically, so I got to work early enough that I could plan on having at least a few mental breakdowns.
If there were something I would do differently this time around, just go ahead and start writing directly to this year's secondary prompts for each school, as opposed to just having a general idea about how you might answer a question. Consider each school's application to be a set of essays that include your PS and Work & Activities sections. All of your writing should be internally and externally consistent, logically coherent, and compelling. It is important that for each school, you are doing enough research to understand what their priorities are...and they don't always make that easy.
You really do need the time, so get started now. I recognize I am really hammering this point but there is no feeling more discouraging than sitting in front of a Word document on some crisp Monday morning and having your mind blank for hours at a point where we know every word matters. Not every day will feel productive, even if you worked the entire time. You will need more time than you think to run essays by folks willing to help (you can sign up on SDN for free/donation-based advising, personal statement reviews, ask questions on Expert Advice Live, and so on). I used every resource I possibly could that would make sense. In some ways, I feel like I work here now.
Many people may look at my cycle now that I've already made it and think, wow, all of that was overkill... but looking back, I feel very justified knowing that if just one school had said "meh, send him back to the streets," I would be looking to reapply, too. I don't feel like I won the lottery, I feel like I survived a particularly traumatic war.
Do everything you can. Work like your life depends on it, because it does. There is nothing more horrifying than putting all of your eggs in one basket and realizing there was a hole at the bottom. Don't let it happen to you... you've worked so hard to get to this point, it would be a shame to just call it here. Spring into action, and hold out hope that there's still time. If anything, working on your application will help you pass the time in a way that is productive and forward-facing.
