For me, it's really hard to learn a new language without a purpose for it. Even more so when languages do not get you jobs. Employers are looking for demonstrable experience in X and not just knowing it.
For this reason I've found that only two things motivate me to learn a new language and not give up due to boredom:
1) A project where the language makes sense. When I was in my second year of university, I started making a dumb fb messenger bot to scrape goodreads and answer with relevant quotes to my friends. That's how I learned Python.
I've found that I prefer fun and gamey rather than serious projects to learn as expectations make me more bored.
2) Read a good book about it. I can consume a book without pressure in my downtime, eg. commute and it usually gets me to a point where I'm comfortable with reading and understanding a language. Then I go to (1) to be effective about it.
