Not an answer but a general comment on learning languages: instead of setting your goal as “to learn as much of a languageas possible”, instead you can go for “I want to be able to do this class of things that will be made very easy once i know thia language”.

If you do the former it’s very easy to learn something then forget it. Furthermore, echoing other comments, you would lack clear measures of success because it almost makes no sense to ask whether you truly “know” a language.