I took the CSM from Scrum Alliance (https://www.scrumalliance.org/certifications/practitioners/c...). It’ll run you about $900 to $1400 depending on where you’re at and what instructor you choose
Your mileage from the course may vary (depending on how good your instructor is), but in the end what the course helped me do is internalize the scrum process and Agile principles better. I really got to see the value they bring to a development team.
A great free series on coursera called Learning How to Learn (also a book "A Mind for Numbers) addresses this in several ways. The biggest win for me was integrating a Pomodoro Timer into my workflow. I'd really recommend going through video series or book or both if you feel like you're having trouble learning, good luck!