What's the most up-to-date way to get proper laptop power management?

I've got a very functional Catalina install on my Dell Inspiron 7586. (i7-8565U, UHD620 graphics)

There are some problems remaining, all related to power management: the battery life is bad; it gets very hot; and sleeping sometimes causes a restart and/or GPU glitches.

I've tried looking up how to get good power management, but there are so many different methods from different times, and I'm confused.

Is RehabMan's SSDT generation thread](https://www.tonymacx86.com/threads/guide-native-power-management-for-laptops.175801/) from 2015 still the way to go? What about Clover's PluginType setting?