If I was in charge I wouldn't change much tbh.

You do have to think how fun will the game be really if everyone has there whole roster maxed and stockpiling huge amounts of gold ready for next levels?

For what I would change Remove & refund players all gold spent on Gear tier upgrades. And permanently remove any gold cost from upgrades for Gear leveling.

And I would adjust the minimum reward from gold orb from 90k to 250k. I feel this would make the Gold orbs much more valuable and would also encourage people to actually buy gold orb offers in game.

I feel these 2 minute changes could help the long term health of the game and give people more options on who and when they level characters up whilst addressing the gold issue without changing too much.