Strong SEO WordPress site not displaying on Google!!

Hi,
I have a very strong website with Search Engine, it was always at the top in Google, some pages shown twice on the first page from billion links result.
Now few months ago I changed my CMS to WordPress and I register it again and again. But even if I write the complete URL of my site then I could see many websites have my link(s) but the site self never shown on Google!

I’m expert in SEO and internet marketing… but this problem I couldn’t find any solution for it!

Anyone please knows, has any idea about that? Why is that? How can I fix this problem?

Thank you very much,

Henk