Why Facebook is deleting Post’s links?
From what I understand you are advertising your websites on Facebook pages owned and run by others in the comments section. Probably admins of those pages are deleting your posts. It is not a good idea to spam other peoples pages.
Best way to drive organic traffic to your website(s) is to work on your own Facebook page, spend some money to advertise you website on Facebook to get people like and join your page which in turn will generate traffic to your website.
Also work on your websites SEO and content. Good content brings traffic that is the key.
Some questions are more important than answers