Just a random thought. What about focusing(or studying) on one language for a day and do it for a week.
- Monday - C++ (use at work)
- Tuesday - Python (use at work)
- Wednesday - Go (use at work)
- Thursday - Common Lisp (try to use for internal projects at work)
- Friday - Rust (plan to replace some components in our product)
- Saturday - Haskell (for hobby projects)
- Sunday - Dart (for Flutter projects)