Take advantage of productive periods, and relax during not so productive periods

It's a common problem with most people who work for themselves, or work from home; you have periods of being super productive, and periods where you just don't want to do anything.  During the latter, the more you try to do something, the harder it becomes.

I've learnt that sometimes it's just easier to go with the flow.

During my productive periods I do as much work as possible, which gives me some slack to work with when I'm feeling...well...slack.  Because my work involves regularly posting articles, as well as blog posts, it's fairly easy to manage.

If you work in a similar fashion, familiarise yourself with the 'Scheduled posts' tool on your blog.  With this, you can space out posts so content is being posted regularly to where you want it, instead of posting 10 blogs in one day, then being silent for two weeks. I do something similar with my other work, and post one article per category I write for per day and keep any extra files I've written on my computer until I hit a not-so-productive period.

The fact is, it's easy to lose motivation when you are completely reliant on yourself for that motivation.  If you do experience this just remember "this too shall pass", and try to be kind to yourself during this period.  Beating yourself up mentally over your inability to work at the level of efficiency you expect of yourself is not going to help the situation, and in some cases it can even make it worse.