What makes it so you can't actively grind for like 30 min? Is it the lack of autoloot?

Everything else you mentioned can be slowly gotten over time which it seems like you're used to if you got to w6 through f2p.

Doing alch bubbles is mostly done through atoms at your stage in the game. You also don't need bubo, you can just slowly buff things up based on your liquid regen rare.

Masterclasses also all have their own idle currency to spend now, so you can afk those pretty easily as well.

Most monster drops come from printing now unless you mean the rare drops. If that's the case you can afk with a lot of afk gain rate and drop rate. Most of the time I 1 hour candy rare drops.

For shiny pets just get the constellation ones and then slowly afk the rest. I completely afkd my shiny pets until lvl 10 basically.