My old boss gave me some good pointers: find Koans. Ruby Koans, Kotlin Koans, there's probably a Koan for your language. It'll help you wrap your head around the basics of the language, and sometimes they'll even help you set up the development environment, which some people have alluded to being difficult.

From there, it's just ... using it. Making lots and lots of mistakes.

I didn't start really learning Typescript until it was a very real obligation for me, and my style of programming and the reasons for it have definitely changed over the last year as a reflection.

Accept that this sort of change is going to happen and that it's natural and even a good thing. It's okay to be new at things again and to make mistakes :)