Besides increasing deviation I think you also need to hide players otherwise it'll be pretty tilting to appear as rank 50 or something after not playing for a while. Proposal: after 6 months of inactivity your deviation is doubled and you get hidden from the leaderboards and need to play 10 games to earn your place back.
HOWEVER i'd also be fine with just cleansing top20 from the ancient relics. Iirc players used to have some hidden from leaderboard property so should be really easy for someone with database access to do a few very simple db queries if the feature still exists (i could remember totally wrong here tho...). I suggest this gets talked about in the holy council !!!
Btw nothing against keyser and zock and whonot