Just keep writing the blog. It will shape itself if you water it enough. You don't know what to write about? Keep writing to find it. You don't know how all your thoughts fit in? Just keep writing them, and they will sort themselves out. Not sure if it will be successful, or worth the time? The only way to find out is to keep doing out. There may come a point when you decide it is not worth the effort and time anymore, and that is fine. But this is not the time. You just started. Extend your attention span, the span of time you expect to see results, progress, what have you. Look at the Portuguese, you can see progress, but it's been months. Keep watering, sowing, what have you. If anything, writing everyday just feels healthy anyway :) And you have to find your writing voice.