Hi Mossa,
Thanks for advice. We have already 2 millions of pages which are crawled. and good number of page views and session/day.
I will go with your point
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You can see, almost all company and event profile have internal linking for other profile and events
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We are doing that but we have pages in billion which is literally time taking as it have countries and events from 200 countries
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It is very difficult to get backlining for billions of URLs, so branding and other activities are there to take care of that.
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http to https have 301 redirection and all sitemap have been updated.