There is a group on Facebook called Lingua Franca Challenge which I started with 2 other people: https://www.facebook.com/groups/linguafrancachallenge/
The goal of the challenge is to learn a language together with the other members of the group. In the first challenge, we learned Swedish together and it was really fun and I learned a lot. In the second challenge, we were tasked with learning Russian. That, well, didn’t go so well 🙁 Russian is very difficult!
But at least I learned Cyrillic finally! It is actually not that hard. I just had to get used to it. It is an alphabet, just like the Latin script that we use in English. Some of the letters are even the same as the Latin letters. Cyrillic is really not that hard to learn. If you want to learn a Slavic language that uses the Cyrillic script, I heartily recommend it 🙂