How to I learn to solve more coding challenges daily?

I'm solving challenges without looking up solutions from the internet. I use the official documentation and debugging methods for help. This method has been helpful because when I go back to solve the problem again, I can implement the code in other ways and apply some techniques to newer and more challenging problems. I used to struggle over a problem, copy the solution, understand the solution, then rewrite it 3-5 times. But I still had a hard time coding a solution up myself. Figuring out the problem without using someone's solution helped with gaps I had about learning to code earlier.

I'm using this method at a month long interview bootcamp, but the pace is slower with me. Is there a way for me to catch up with the class, while working on the problems the way I do right now?

I'm also asking this because I know that when I work in a company, there are time constraints. I'd like to figure out a way to code at the pace needed, but still learn what I need to learn without skimming over material.

Any advice is appreciated.