You’re going to have to create a lot of redirects.
Tips…
Google sheets is good for this.
Create at least 1 redirect manually as a test, export your existing redirects first, add your new redirects to that exported file in a spreadsheet, and then re-import it
In your WP site, it’s often easiest to use the sitemap and an online tool to extract the URLs, and find your blog ones
The rest is copy-paste, or formulas to create your redirectTo path