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Yeah, if you are in it for earning a living, you may have to prioritize that over passion. You can do what you are passionate at on the side, but for money, you need skills and effort plus choosing the most marketable thing.I think you need to work on the niche that has high CPC rates in stead of looking for passion. You might be passionate about entertainment but this niche does not bring a lot of revenue.
I personally have 4 Blogs and all of them are good I also have a forum which is not yet hosted,if you need a blog that is very simple you just need to use blogspot creat a blog and if you have traffic you can monetize it with Google AdsenseIf you want to open your blog then just go for it. You don't need anyone's approval. You got nothing to lose and even if it doesn't work out the way you want it, you will still gain more experience and knowledge
it doesn't matter which fields do you chose because we saw many successful people in all the fields.
for me, the most important thing is to choose your domain where you can create and edit high-quality articles and for sure you will attract more visitors day per day.
be patient also and try promote it on Facebook or on Youtube^^