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Thank you for your answers. One more question: I read articles that google, when taking about E-A-T, although it treats subdomains as a separate domain, it still knows that this is still somehow connected with the main domain, so the subdomain will still negatively  affect main domain rankings almost the same as having the forum in subfolder. If that is true, then I come with the below situation: 1. The main domain wont get back its old - great  rankings by removing the forum from subfolder to subdomain. 2. The forum that 15 years now is the best in country with thousands of posts and visits, it will loose it;s traffic, too. Confused!! Any opinions on that?