It depends on who you talk to and what specialty you are pursuing, but I wouldn't recommend aiming for StatsPearls. Even if it takes a few hours to write them, it definitely will look better to have 1-2 good quality publications that took a few months to produce rather than 5 that are mediocre. And it is not impossible to get a high number of publications in good quality journals if you really dedicate yourself to it. To find case reports, think of some doctors you want to ask either at your school or at places with a lot of research, and look them up on pubmed. If you aren't sure who to ask then find people in your field of interest and narrow down from there. If you see that someone published 10 times in 2020, 2019, etc. then send them a message. You want to find a PI that publishes often for a few reasons. 1. multiple projects will be available 2. more opportunities to lead your own/potential 1st author 3. if they don't do research often then it will take much longer to get things done and they wont be able to guide you as much.