With so many websites, would it be better combining them all into one parent website, like Reddit and their sub-reddits?
I see you have links to your other sites, but maybe Google rank for a parent site would be more prominent since the one parent address would have a lot of traffic.
Maybe have a parent site that lists/links out your 45 (or just the a group of related sites) and maintain the individual addresses. Then have a link back to your parent.
I guess this is more of a branding idea. Google Parent Alphabet, with Google Mail, Google Drive. Also, honda.com
(You obviously know what you are doing, so take this is just a question, not a suggestion)
I kinda have that in boeren.nu. But my reasoning was that you can't be everything to everybody. A farmer might enjoy reading about tractors and cows, whereas a mechanic couldn't care less about the cows. I could make it easy to add interest to your profile, but only 20% of my visitors are logged in.
Also, while I certainly think of Google when I build things, I think of my visitors quite a bit longer. I always look at Google as the company that tried to replace me with their silly Google+ communities, as well as the company that sends me 40% of my traffic.
I see you have links to your other sites, but maybe Google rank for a parent site would be more prominent since the one parent address would have a lot of traffic.
Maybe have a parent site that lists/links out your 45 (or just the a group of related sites) and maintain the individual addresses. Then have a link back to your parent.
I guess this is more of a branding idea. Google Parent Alphabet, with Google Mail, Google Drive. Also, honda.com
(You obviously know what you are doing, so take this is just a question, not a suggestion)