Here's the thing: write that. Go meta, just a little, and write about your journey. "I thought this, but then I found out that, and now my questions have evolved thus..."
I think it was Orson Welles who, when somebody asked him if they could write his biography, said, "No, because it will be false. You may write the story of your attempt to discover the truth of my life."
There is also nothing wrong with serving good knowelage, even if you can find the information somewhere else. Maybe your source is 10 years old, what has happened since? Or maybe its hard to understand for laymen. Or maybe the other sources will fall off the web, great websites disappears in the thousands every day.
Maybe someone is looking for a tech, but there's little info out there, even if the i info is good, it can still be dismissed. Help spread the knowledge.
Then there's the noise to signal problem. Your blog will be a light beacon - for others to navigate around all the crap.
When you're familiar with an idea, it seems to you like it's obvious and it's mentioned everywhere, but there are also lots of people out there for whom it will be new. Maybe you aren't the first one to say it, but you're the first one they heard it from. You'll inevitably put your own spin on it, too. I've been working on convincing myself that it's not necessary to come up with some completely novel thought that nobody ever thought before in order to just post something. Practically nobody does that.
Not everything has to be new or novel. You may add to the discussion and enhance it by writing about what informed your change of heart.
I'm 26 and I see people writing about stuff that are much younger than me and I still think "I know nothing". Maybe I have a huge case of imposter syndrome?