Greetings,
I know, there were zillions of suggestions before and alike mine too
HOWEVER
-additional Raid Finder for real T1,2,3
-cooldowns: T1 cooldown 24h; T2 cooldown 48h; T3 cooldown 96h
-exchange rate: T4 relic = 40 T3; T3 relic = 20 T2; T2 relic = 10 T1
I would say 25% more population in the game in 6 months
Cheers)