In Nigeria can you count some difficult university courses? If yes, if you need work, go for one. Those that studied French, Hausa, Igbo and Yoruba are getting good employment in Nigeria. But due to ignorance most Nigerians ignored them. If you study one of those courses, you can get easy employment with any one of the Nigerian Universities as a lecturer. You can also start teaching other people at home or online.

don't create unnecessary enthusiasm, if you've tried learning a new language you'll known it takes years. you could even learnt it for four years at the university and still struggle with it. 80% of french and german graduates in nigeria cant comprehend when you play them the news or a podcast in the Language they claim to have studied.

on nigerian language, i wont say anything i don't know but i dont come across job offers where they call for our languages, except for hausa which the telecoms sector call for. if theres something im missing please enlighten me..we learn everyday.