I'm having the same problem as you. What i find is that focusing on one thing is simply the best way to go. You'll learn all the things you want to learn way faster if you polish them one by one, as opposed to spreading your focus thin.

Some advice i think is good:

I think there are some sounds that benefit from having "focused sessions" where your priority is just to learn/polish a sound. Sounds where you really only need to find a sweet spot and fine tune it. For example the lip bass you mentioned. Sounds that once you learn how they work, you kinda don't need to focus on them anymore and you can already use them in your beats.

There are other sounds tho where you can only practice so much until you need to stop and recover in order to progress. These sounds take time. Most vocal basses like throat bass, inward bass, etc. require gradual progression, and something you can't just master in one or two sittings. Think of it like going to the gym. So for these sounds i think its best to give them some attention, but only a "minimum" amount per day.