Because you'll spend a thousand hours or two in total to learn a new language, you can save yourself a sizable chunk.
Achieve that by applying The Pareto Principle.
It says that the effort that you put in doesn't always lead to a corresponding output.
Typically, 20% of the effort can give you 80% of the result.
(And 20% of that 20% can give you over 50% of the result.)
In non-mathematical language, you can get an A with a lot of effort.
You can get a B with a weekend's effort.
And you can get a passing C doing your work on the ride home in the bus!
So ask yourself: What is helping me the most?
Then do more of that!