ISTM that instrumental rationality overlaps a great deal with self-help/improvement.
It's a subset of it. But there are a lot of other self-help topics that don't belong here except (as for any topic that isn't rationality) when there's a specific rationality angle being discussed: diet, physical fitness, personal organisation (i.e. things like GTD and 43 folders), and so on.
Here's our place to discuss Less Wrong topics that have not appeared in recent posts. Have fun building smaller brains inside of your brains (or not, as you please).