OP, some hard advice here.
I understand you had a car-related emergency, and that is a sadly common story -
statistics show a large fraction of Americans can't handle a $400 unexpected expense without borrowing.
We all get messages about saving up for an "emergency fund", which is a reasonably good idea (I don't though), and you're trying to rebuild it. The thing is, credit card debt, generally at 20% interest or something absurd,
is its own top-priority financial emergency. Don't think about having an emergency fund until the emergency is over.
If you have any money in the bank that is not specifically earmarked for something that is even higher priority, life-or-death items such as "paying rent" or "getting food to eat" - especially that $300 you were planning to take a vacation with -
immediately throw all of it at the CC. Two months ago.
Refinancing using a student loan to cover CC is a generally good idea - you immediately reduce the interest rate to something less insane, at the price of not discharging it in bankruptcy. Planning for bankruptcy as an out isn't the best idea anyway. The logistics are simple since money is fungible; they can't track which dollars are used for which expenses.
But the real hard advice comes here: take a good long look at your spending patterns, aside from the emergency. Are you living paycheck to paycheck? Most importantly, what happens when you have some financial good fortune and more money shows up in your bank account? If your instincts are "take a $300 vacation", or some form of "spend most of it", then what's stopping you from clearing the CC, and immediately running it back up again on impulse purchases?
Our capitalistic society works by exploiting people like you, with obscene amounts of advertising and other lobbying to psychologically manipulate people into buying random crap that isn't worth it. You've experienced a dip into the world of having all your earnings drained away by debt slavery - CC interest, payday loans, etc. The only real solution is to control your impulses to spend, so that you're saving money no matter how much you make.
Just another example of how capitalism is rigged: I use CCs as much as possible, even on 4, 5-digit purchases. Why? I get large rewards, at least 2%, up to 5, 10% back, to the tune of thousands of dollars a year. And how do the banks fund these gifts to me? By charging usurious interest on things like your CC balance. It's a truly regressive system of financial transfers upwards. The only time I've ever carried a balance was by mistake, and it was costly, but less than the rewards I get, since I only mess up once every 3-5 years.
As an extreme case (don't take this as a requirement, just a possibility capitalism tries to hide), I was a FAANG senior engineer. I deliberately refused to spend more than the median income, despite earning 10x that, even in NYC/SFO. The flip side is I'm retired after 10 years of work, starting from zero. I make more doing nothing but watching the stock market than I spend, so I literally never need to work again. What I make is a 1% problem; the truly critical part is "what I spend".