As usual, I’m up just after 5AM and typing, creating my language focus. So the habit works well for me.
As I say, it’s the first tool.
The second tool is a resource—the ultimate resource. Quite simply, it’s a book.
Any book will do, I claim. Fiction or non-fiction, it doesn’t matter. As long as it’s something in the language you are interested in, written for users of that language, of a decent length, at a decent level, and is of interest to you, then you may safely conscript it.