Pediatric nursing residency competitiveness

I have a bachelor's degree in biology, but only a 2.9 GPA. This grade is not reflective of my true potential. I would be getting an ADN to start. I am wondering if hospitals readily accept ADN graduates or mostly BSN graduates? What are good ways to make yourself more appealing as an applicant. My current pre nursing GPA is 3.7, I had to retake classes as it's been 11 years since taking them. Thank you for any help!