Are you doing private blog networking? You should be doing it in the right way otherwise there is no benefit that could be derived from using such a service. If you have not planned and properly researched about it, you might end up having nothing or even negative results, despite of putting whatever effort in maintaining all the blogs. Private Blog networking is not a simple thing to do and it does require effort which is not considered by most of the search engines, but to some extent it can never be categorized as a white hat strategy for SEO purposes. Reason is simple, you are creating backlinks of your own website through your own websites without any proper content behind. This means it is just a marketing tactic and nothing else. However, to make it good for the general public, you should at least work on your content. Content is the king in SEO industry and it should be written for the end consumer keeping in mind that the search query be responded properly if your site happens to be at the top in response to a particular search query.
A trick to your PBN network:
There are many tricks that are involved is successful running of your https://21pbn.com, but one trick is mentioned here for your ease. You should use servers from all over the world to host your different blogs and websites. Because legit websites are not confined to one country and they should appear from different countries in order to make sure that things are proper. https://21pbn.comis a nice way to start with your gambling site online. This business is good these days but providing excellent service is not enough, you have to do some extra to get into the business and start making exceptional money.