I wosh I had time to learn new languages as I used to... but with 2 kids, one being 4 months it is nearly impossible. How do others devs hungry for knowledge deal with situations like this one?
Go is a language you can pick up in a relatively short amount of time.
The syntax is in the vein of C and Python, so it's probably familiar. The language itself is fairly small, and the focus is on simplicity over expressiveness. If you want to learn new languages but have limited time, my answer is to take a look at Go.
With two young children, try to get enough sleep. All learning is more effective when you get enough sleep.
With that in mind, spaced repetition is a great technique that fits with having limited time in small blocks. Squeezing in some time here and there becomes a strength instead of a weakness.