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Hmmm, this is a difficult question to answer as this is determined by bid type, demographic, business sector, bid amount, quality scores, ad copy, your competitors and more etc There are too many variables to give you an exact answer.

should we invest more on adwords and organic isn't important like before?? The first question..... Can you make a profit with Adwords?   Most people don't make a profit and don't know it because they don't know their real costs and margins  -- or they hire an SEO who bids without any of that information. Second question...  Can you pull off the rankings?... Most people can't... and that's why they are blowing their dough on Adwords. Answer those questions and you know if you should take Door #1, Door #2, or Door #3 (which is try a different project.

Hi Pintapin , i am understanding you have a website that runs on the .com domain but you also have the .ir domain.  And you want to know what to do with the .ir domain. So if you are in Iran and your users are likely to look for your domain with the .ir domain, or you actually communicate the .ir domain, you should setup a 301 to the main .com domain. I am assuming here you have been the only owner of the .ir domain so there wouldn´t be any legacy issues. Not redirect - so park domain, disallow, delete domain - will only benefit the SEO of main domain if you would suspect to have spam problems on the .ir domain. Hope this helps, (if i didn´t understand the issue correctly let me know)