[quote]Decay [b]Players that achieve the Gold III Division rating or higher may notice their Division rating begin to decay due to inactivity.[/b] Gold III Division players and higher will be awarded one Decay Protection Point upon completing a match; moreover, [b]players should be aware that they can only hold 12 Decay Protection Points at any given time.[/b] A player's Division rating will begin to decay if they become inactive by not regularly playing Crucible Competitive Division matches. [b]Lastly, every week during the Weekly Reset three Decay Protection Points will be subtracted from a player's total. If a player has less than three Decay Protection Points they will instead lose 250 Division Points[/b].[/quote] https://help.bungie.net/hc/en-us/articles/11269047447956-Crucible-Competitive-Divisions

You were demoted because you haven't played comp.