I cant find games in any playlist

I really enjoy halo 5, and want to spend all my time playing it. However in recent weeks people have been reporting me for cheating even though I am just playing the game normally, and now I have the red reputation and cannot find any multiplayer games. How can I fix this because I’m SR147 and dont want to start a new profile for nothing.

I don’t think I’ve ever been reported. What were you doing that made them report you?