You need to change your way of doing it.
For me it takes about 1 week after publishing a post for it to show up in SERPs.
Do your posts get indexed by Google? If yes and you still receive no traffic, that means your keyword targeting is off.
Search engines won't start sending you traffic, no matter how long you wait. Change your approach.
the 1st autoblog I created has 41 total posts, of which only several are indexed, but also about half of the category pages are indexed, too.
I siloed the autoblogs properly from the get-go with the belief that if they start ranking at least I won't have to change the URL structure and thus screw the rankings. For example, let's say that my autoblog is in the health & fitness niche (just an example). Well, I siloed it like this
PAGE 1 (domain . com /
diet)
Post 1 (domain . com / high-search-volume-
diet-based-keyword-1)
Post 2 (domain . com / high-search-volume-
diet-based-keyword-2)
Post 3 (domain . com / high-search-volume-
diet-based-keyword-3)
...
etc.
PAGE 2 (domain . com /
detox)
Post 1 (domain . com / high-search-volume-
detox-based-keyword-1)
Post 2 (domain . com / high-search-volume-
detox-based-keyword-2)
Post 3 (domain . com / high-search-volume-
detox-based-keyword-3)
...
etc.
PAGE 3 (domain . com /
weight-loss)
Post 1 (domain . com / high-search-volume-
weight-loss-based-keyword-1)
Post 2 (domain . com / high-search-volume-
weight-loss-based-keyword-2)
Post 3 (domain . com / high-search-volume-
weight-loss-based-keyword-3)
...
etc.
PAGE 4 (domain . com /
muscle-building)
Post 1 (domain . com / high-search-volume-
muscle-building-based-keyword-1)
Post 2 (domain . com / high-search-volume-
muscle-building-based-keyword-2)
Post 3 (domain . com / high-search-volume-
muscle-building-based-keyword-3)
...
etc.
PAGE 5 (domain . com /
exercise)
Post 1 (domain . com / high-search-volume-
exercise-based-keyword-1)
Post 2 (domain . com / high-search-volume-
exercise-based-keyword-2)
Post 3 (domain . com / high-search-volume-
exercise-based-keyword-3)
...
etc.
So, as you can see, the autoblogs are VERY WELL structured (siloed), so the reason they don't bring traffic in yet can be attributed to other factors, namely one or more of these factors...
1) all of the keywords have high search volume, therefore they are too competitive but I did this on purpose to see which topic ranks easier. When I see one topic break into top 100 I will know that that topic has higher chances of ranking easier, so I will focus on creating content for long tails in that particular topic.
2) the articles are too short (between 550 and 800 words each)
3) the domain name is new (by the way, are your autoblogs set up on new domains, or on aged domains?)
4) there is no on-page SEO done AT ALL! As a matter of fact, all these 3 autoblogs have only 3 things: a long wall of text, a title, and a banner for an affiliate product (clickbank usually). That's all! There are no images on these autoblogs, not even headers or footers, no menus, no contact / privacy / about us / ToS / disclaimer pages of any kind. Just a title + article + affiliate banner.
And I won't change any of these.... not for these 3 autoblogs anyway. I might do things differently for future autoblogs, but these 3 will stay like this because I want to see with my own eyes what ranks and what doesn't.
What do you mean by "change your approach"? What is there to change to any of these? I have done things perfectly with regards to setting up these autoblogs, so I don't see what I could change