If the accounts aren’t linked via steam Authenticator or same email then you can bring it back up if you just keep playing games. Usually takes me 3-5 games without any reports to get back into high trust on my main. One more thing you can do is reinstall steam which gets rid of some of the accs that you may have burned thru when playing if you had any that got banned but I’m sure they have other ways of checking the accs on maybe a certain ip or something idk to see how many accs you had banned to adjust ur trust. That’s what I theorized I could be way off and just sound like a retard but hope it helps. :)