I have a blog which is ranking well for certain terms, and would like to repurpose it to better explain these terms it is ranking for, including updating the url to the new term the blog will be about. The plan being to 301 redirect the old url to new.

In the past, I've done this with other pages, and have actually lost much of the rankings that I had earned on the original URL.

What is your take on this? Maybe repurpose blog, but maintain original URL just to be on the safe side?

Thanks