I have to somehow clear up to 40 Celestial Rifts

I've been playing for about 25 days and I'm on my third Celestial Rift. Even when my opponents have low combat power, they're not easy opponents, and I only encounter veterans. It's the same whether their power is low or high, and they're always either chainsaw users or swordsman with surfboards. Up until two matches ago, even high-power opponents were users with mixed rare or epic gear, or low-tier legendary users, but maybe it changed after I finished the arena and joined a division/clan.