I know multi languages but always struggle to master them. For example, if I focus on Python currently, then I forget others, if I focus on Java currently, then I quickly forget Python. Do you have such issue? If yes, how do you solve it?

Currently, I am looking for a job, I focus on Python, while I see that are many jobs request Java as well, should I practise Leetcode with Python and Java at the same time or I should focus only one language?

Many thanks.