Game broke beyond repair
Sorry, things are far worse than it looks on a surface. Not only Era is being badly designed, there are tons of defects, relic delta glitches and works unexpectedly, paying for any era progress does not progress you, game mode is ultimately boring and not fun. Revert this, completely.
Your game design here: 1. introduce relic delta, so relics become much more important than ever 2. add new relic level 10 3. hide relic 10 behind paywall of boring artificial new „gaming“ mode colosseum. 4. profit.
Getting relic 10 mats designed in a „betting“ form — you need to compete with other „junkies“ in auction for a place in virtual rating to get them, how much you spend depends on how much others bet. No upper limit.
Your suffering is part of design. That‘s a shame, but that part of a plan.
That the whole game design of CG. Relic delta not a separate thing but one of the main pillars in how to hinge players and force them to spend. Main thing — you forgot that this should be fun. It‘s not. There is no insensitive to play that. I can spend my time for better activities in life.