Excellent advice. I think everyone has a lot more to offer than they can begin to realise. Sometimes all it takes to fire the brain cells is having an explore through posts under tags of interest and seeing what others are writing about.
One thing I have noticed is that it is better to take a topic and break it down into parts, and then do posts on each part to build up a story (take gardening for example, there are so many topics within this broad label that one could never run out of things to post about!).
As long as we make sure our posts are quality, and as I read somewhere recently - evergreen (aka relevant for years to come) - then the contributions are worthwhile. And this doesn't mean we can't have fun in our posts, either. Humour is a wonderful way to engage the audience; but definitely find your own voice and use it well. :)
That's a great point about breaking one topic into smaller parts, thanks for sharing your thoughts!