Mine went up to 758, this from a dumbass (me) in the early 90s that had a BK, repo, lots of credit card debt, etc. from the mid 90s. It'll take some time to repair but if I could do it from the lowest score possible to a pretty good one, you can too! Not sure if there's a quick way to repair your credit. I did use a credit repair service that removed some negative remarks on my report years ago, but it still took time to re-establish it. It's a credit history after all.
Of of the things they told me to do was to get a secured credit card (you have to put down a deposit, the amount then becomes your credit limit), use it on things you'd normally pay cash or write a check for, and pay the balance off every month. Makes sense, without a credit card it'd be hard to rent a car and book a flight these days. After two years I got my deposit back and the card became an unsecured credit card.
I got a car loan and was never late. Car loans are easy to get, you may pay higher interests because of your low credit score, but you can always refinance it.