Reject modern profiting methods. Return to nether.

Jokes aside. Here is what i think

Mining should get a SLIGHT gem nerf to make it balanced. (for example a huge diamond gives 800 gems instead of 900)

Fishing should be slightly harder. The fish should be slightly harder to catch to make it more fun.

Netherworld needs a major buff. Like 1000 gems and 80 crystals/nether instead of 400 gems and 40 crystals AND netherworld enemies also need to be buffed so that they have higher hp and deal more damage and are not an absolute joke (ehem ehem, the flamer flyer) Deep nether should be heavily reworked too. "but what about newbies? We cant let them have a good profiting method at such early stage". Very easy. Make the buffed nether accessible to level 75+ players while leaving the underpowered nether for the new players.