I would also like to have an overview of my website. I currently have 6 blogs and over a dozen niche websites. That's pretty much enough to keep me busy. By the way, in the upcoming Niche Sites Challenge 2020 you can learn how to build such a niche website step by step and make money with it. What would be the easiest website to maintain? If you really plan to operate a lot of websites, you should make them as easy to maintain as possible.
Static HTML would be best, as it doesn't need to be malta mobile phone numbers database updated. You should also create a dozen timeless texts that don't need to be updated. For monetization, you can use Google AdSense or another automatic affiliate advertising tool, which you no longer have to worry about. However, I would have concerns about cookies and data protection. In addition, the imprint and privacy policy would have to be managed centrally and somehow integrated automatically here.
After all, it would be very time-consuming to update these texts on every single website. This way, the maintenance effort would be very, very low and you could create and run many websites like this. It would be an interesting project to create such an extremely easy-to-maintain website. Perhaps that would be something for a new case study. How many websites do you have? Finally, I would be interested to know how many websites you operate and how much maintenance you put into them.