Websites and Online Marketing are two very complicated subject. Domain name is only one very simple variable. If you only have a domain name with a landing page and you don't do anything with it, then you probably won't have any traffic.

It's not because something is online that people will come to it. You have to put effort and energy into it if you want anybody to see it.

For WordPress, you could run a multi-site installation that would allow you to manage all of your website in one dashboard. Giving you the flexibility to manage a lot of websites inside one single interface.

Regarding your domains, if you only put a landing page, without any marketing, there is a low probability that people will ever come. You should cut down the list to a smaller number. A number of website which you can manage, market and write for.

I'd be happy to help you on the phone if you have any further questions.