Also learning a new language
This is without much immersion (due to lockdown then traveling), and the instruction is online, and I've been a lazy bum about additional study.
It's made me pretty optimistic about learning new languages in general, and I'm 50 so the brain isn't exactly a sponge anymore. More like a sieve.
The best thing is that even if some weeks or even months I do not feel like studying at all, I can just continue with the Anki decks for 5-10 minutes a day to make sure I continue to retain what I had already learned. It has not become my bedtime routine/habit.