Link account

My old account (Imbalich) was linked to my Steam (Lichimba). I tried to link my brother's account (Savok) to my Steam. we played the campaign, 2 years have passed, my brother has not played for a long time. And I can't link my account to Steam again. Writes that the account is tied to Savok. He does not remember anything, he cannot log into the account.

My old account FAF: Imbalich
My account steam:
My Brother account FAF: Savok

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Please help me. How i can link My FAF account (Imbalich) to My Steam account (Lichimba)

Thank you very much. everything worked out!