Anyone else having trouble with the late-game mechanics in Casy Game?

I've been playing Casy Game for about twenty hours now, and I'm really enjoying the core loop, but I've hit a wall with the endgame progression. Specifically, the resource gathering seems to drop off drastically after reaching level 30, and the boss fights feel disproportionately difficult compared to the rest of the content. Has anyone figured out a reliable farming method or a build that makes the later stages more manageable? I've tried optimizing my inventory and upgrading my gear, but it feels like I'm just spinning my wheels. Any tips on late-game strategy would be greatly appreciated!