Ask HN: I am busy with too many things at once

Hi NH.

A couple of years ago I realised I was a mediocre programmer. After 5 years of work experience with unfinished degree I knew only one language (php of all...) and some good practices on a surface level. I set that for change. For 2 years I studied in my spare time, learned a bit of Java, go, clojure, learned some fundamentals and good practices classics (gang of four, DRY) started reading blogs and following the industry.

Except, it's too much. I realised I am into too many things. I know a bit of everything, but not too many things well. I want to study data science, maths, devops and find that my desire is driven by fear of becoming outdated and irrelevant. I would appreciate a piece of advise on managing the learning process, get the joy of tinkering back and conquering the anxiety of ever changing rules to the game. Thank you.