You'd probably want to "silo" your topics somehow, so Google sees that you talk about several themes.what if i wrote about one subject for like 2-3 weeks heavily?
but then wrote about something else afterwards
I haven't looked at your blog lately and this is a random example:
Have a blog menu and put posts into categories, like Sports, Life, Making Money, Cars, etc.
If you talk about Mturk put that post under the Making Money menu item.
Talk about dealing with a stressful day, put that under Life.
You get the idea.