How to update wordpress post without overwriting content

Hi Samliew

Sorry for not being 100% clear on what I’m trying to achieve. I used Make to add a lot of blog posts to my website. When the posts were in the backend, I discovered a flaw in my flow, meaning that I accidentally added the wrong rows to the wrong custom fields.

So now I am trying to update the custom fields with the right data from a Google Sheet.
My flow goes like this:

WordPress - Search Posts (to get the posts)
Google Sheets - Search Rows (to get the new rows)
WordPress - Update a Post.

I have set a limit of 150 posts to return in the first WP module, but when I run the flow I update 500+ posts if I don’t stop it.

Is there a better/smarter way to update posts in WordPress? I tried following this method: