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guest posting is not dead imo, the easy spammy version is. a few relevant placement on real sites can still work well, especially when the content fit the audience.

domain age alone does not move rankings much imo. a clean history helps, but strong content, topical relevance nd quality link can let a new domain compete pretty quickly.

this might be becuz of shared message among all accounts. It is recommended that you should check any recent activity related to payments, domains, login details, devices, or campaigns since Google has become more capable of finding any suspicious pattern among the accounts.