Depends on what you’re interested in, if there’s a certain topic that fascinates you try doing a class on that. If you either don’t have a particular interest or don’t want to focus on a particular topic yet, I think a data structures and algorithms class might be good. Here’s one on coursera https://www.coursera.org/learn/algorithms-divide-conquer#enroll. I don’t know if it’s good since I haven’t tried it but it’s rated pretty highly and it’s not too long. You can look for classes on places like class central. There’s also Cs50 beyond https://cs50.harvard.edu/beyond/2019/. I kinda think it might be good to try playing around with the stuff you learned in cs50 before going to another class, you don’t have to make an app or anything, just play around for a day with some of the stuff you learned from cs50 and see what you can and can’t make. I think this would help let the knowledge sink in a little bit, keep you from being bombarded with knowledge, and help you figure out what you want to do. Just remember to make sure that you’re having at least a little fun, it’s hard to motivate yourself to learn something if it makes you miserable.