Welcome to the Q&A Forum

It will depend on the subdirectory structure. Generally, it is suggested for the post to be directly after the domain. Generally, the subdirectory is used for categories. I see it as a keyword opportunity: If you think that the keyword of the category can help the optimization of the post and ranking, then you can use the category subdirectory freely. For example, if you are running a course site, and you'll be posting a course on "Python", then "www.site.com/course/python/" would be a more optimized URL than "www.site.com/python/" as you are targeting people who want to find a python course. However, I usually refrain from using the subdirectory structure due to the different targeting between posts. Daniel Rika - Dalerio Consulting https://dalerioconsulting.com/ info@dalerioconsulting.com

I back what EGOL has said

First I'd confirm that the site actually has no ranking keywords. Moz's keyword index isn't as strong as its backlink index, so you might want to scan the site (at the domain level) in tools like Ahrefs keyword explorer or in SEMRush (to help confirm whether there's a real lack of ranking keywords or not). If the site really doesn't rank for anything, I'd question whether they had manipulated their DA and I probably wouldn't go for the backlink