If I were you I would look for people asking questions on these forums and try to provide good full answers to those questions. If you see a question that is asked multiple times that would be a great one to make a blog post about that answers it and perhaps shares some of your experience on your homestead.
If you look around at the threads on here you will find tons of them where someone is posting a question seeking answers. Even if the question was already answered you could still write your answer to it as a blog post. There are a ton of potential content ideas in those question threads.
There are over a million visitors to this site monthly. So getting a good reputation here answering questions could help you attract visitors to your site. You can add a signature in your profile and link back to your blog.
You can also share you blog posts on here as long as you provide some real value here too and not just a link.
Promote your site for free on permies:
https://permies.com/t/20020/Promoting-Stuff-Permies-FREE
Nothing wrong with asking for ideas on here too but you will find a ton of ideas just by digging into all the threads already posted.