What helped you rebuild your credit after taking on student debt?

I’m finally getting to a point where I’m trying to clean up my credit after years of student loans. During school I didn’t pay much attention to my credit, and between the loans and a couple missed payments early on my score definitely took a hit.
Now that I’m working and trying to get things back on track, what actually made the biggest difference for people here. I feel like there’s a lot of conflicting advice online about what actually moves the needle, so I’d love to hear what worked for real people who’ve gone through it.