Here are a few ideas:
1. Do a Linked-In search for technical editors
2. Go on X (Twitter) to find a publisher (e.g. @OReillyMedia) and scan their followers/following lists
3. Visit Amazon.com and search for books similar to what you're trying to write and view their preview pages, which often include copyright info and contributors. Then you can do a search on those people's names on a social media site to make contact.
4. Amazon.com has a self-publishing service and offers resources to help authors in different aspects of the publishing process. I haven't done this and don't know for sure, but there might be a way to join that program and do a search for editors that might want to offer their services.
