Taking on more debt almost never helps your credit score in a way that you can't otherwise achieve. (The major exception to that is someone without any credit history.)

If you're paying your credit cards on time, preferably in full, and not charging more than 30% of your total credit, then you'll just have to wait your time for it to rebound. A loan won't make it rebound faster.

Credit is real easy to trash, but it takes time to restore.