What skill can I learn by myself?

Hi everyone! I’m currently looking for a job in the non-profit sector (human rights-related). Also I plan to move abroad (the Netherlands or Germany). I’ve started learning Dutch with Duolingo but still have a lot of time home by myself and feeling pretty down most of the time. So I decided to use this “sad” time to develop myself, maybe find a way to have additional sources of income. Any advice what skill can I learn by myself? I’m very curious and dedicated so I think I can learn just anything

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