I need help!

I’m trying to link my CSGO account to the site to play CSGO on your servers, etc., but! I can’t, because it says to me that “An unexpected error occurred during registration. If the problem persists, contact support. ”! I seem to understand why this is, because I used to have mail that I abandoned, and a password, etc. I forgot and because of this I probably can’t link my CSGO account to a new one … I know the solutions to this problem! Please untie my Steam account “https://steamcommunity.com/profiles/76561198147814711/” from my old page so that I can already play on it!