There's no need for a niche, if you're just posting regularly, you will be in the top 10% of users.
Avoid spam and plagiarism and you're in the top 5%
And make your posts interesting, entertaining or useful and you will be doing amazingly!
Have fun
That's true, if you're confident of posting about different spheres of life, why don't you go for it. As said in the post, there are two types of bloggers
General and specialty bloggers, Although i think that for the struggling blogger, having a niche is the best way to go.
That may be true generally on the internet, but on steem, it's not the case.
It's a whole different ecosystem here