Don't worry about the fact that you "failed". What you presumably did is work hard, and learn a lot, and probably created some quality stuff, regardless of whether it ended up being published. That's usually all your potential employers will care about.
The people that work for companies that end up going out of business aren't considered failures. They generally produced quality work but their company may have just not been able to find / convince the right customers, which is equivalent to you not having found the right publisher. This is an optimistic way to look at it, but that doesn't mean it's not true in your case.
I would publish whatever unfinished books you have on Amazon as e-books. Make a title and cover image. That way they're 'published' immediately, and each book will even get a DOI and/or PMID #. Then you can continue to edit them and finish them whenever you have time (see: https://kdp.amazon.com/en_US/help/topic/A2KRM4C8E91086).
Meanwhile, if you have other non-book writings, try publishing them as guest-blogger posts on other people's existing blogs.
best of luck,