Thought this tip might prove useful to some.
Use keyword clusters to figure out what content to remove. These guys got a 110% increase in organic traffic. The article has an in-depth how-to.
Nod to TL;DR Marketing
Nice tip but not applicable to 99% of people here. Their website had over 20 million URLs and was poorly managed to create such a mess in the first place. You won't get these results by combining a few blog posts here and there on a small website.
SEO is too much work, but I'll give this one a shot. Removing > adding.
It's kinda like using keyword clusters in reverse. Cool idea, seems worth a shot. Thanks!