'Productive' can be be recontextualized.

Reclaimed.

You can be productive at developing your skill at a hobby you simply enjoy partaking in, for no monetary benefit.

You can be productive at researching or learning something you are simply curious about.

You can be productive in many contexts other than 'producing profit for your boss'.

You can be productive at setting up a literal house of cards, and then knocking them over for fun.

You can be productive at coding a silly little tool that probably only you will ever use.

You can be productive at teaching a dog how to play catch.

The following is a current and valid definition of productive:

Yielding favorable or useful results; constructive.

Basically just means: you accomplished something, or took meaningful steps toward accomplishing something.

Doesn't need to have anything to do with producing profit, performing a role/task for some other person.

You can have a productive therapy session where you succesfully confront/express something you hadn't previously, fully experience your emotions about that, and come to terms with them, gain better understanding of yourself.