You will find your own niche . I do nt imagine you will need to look very hard . By this time in your life , you will have a very good idea of what you will want to do . In fact , Ill go further and say the ideal situation would be that you will not be able to stop yourself pursuing your passions .

Question: What might I do after I find my own niche ?
Answer: None of the above choices .I will find the ideal situation for others to find their own niche .I will try to be passionate about it and then pass it on to my friends .I will dedicate my life to turning that niche into a paying job that I love .