First you need to discover the purpose behind your blog and it’s importance.
If you are a blogger, your whole identity surrounds your blog postings.
If you are trying to attract steady readers you should post at least 2 times a week around the same time. 3 times a week is ideal. Utilize google analytics to know which days you should post and which topics are the best.
If you are a business and you are keeping a blog to keep your material fresh and your readers interested, then once a week should be suffice.
Again, utilize google analytics to know which days you should post and which topics are the best.
With blogging, consistency is best. Make sure that you advertise your blog by posting it on social media outlets that are best for your demographics.