Good question! This is sort of trivial, but at least for a start, I always dedicate usually about an hour (which is a lot of fun actually) to go through Summary of New Features in docs when the new version is coming out. For example for V12.2 that is already running in the cloud:
https://reference.wolfram.com/language/guide/SummaryOfNewFeaturesIn122
For those functions that catch my eye I would play with examples of functions in doc pages until I get a feel of them. That's maybe planting a seed of new habits for the new functions.
