Multiple Blogs Questions I Have?

[Inimitable Specimen]

I have a lot of questions about running multiple blogs. I might have more later, in which I'll post more questions again. Thank you for the help.

Would it be more beneficial (for followers and the like) to create multiple blogs related to the things I like? I tend to change my mood and the things I’m “in to” frequently, so I’d sort of abandon some blogs for a while. Is this okay to do? Does this seem to be the only way I could/would get more followers? How many total blogs am I allowed to have if I choose to make multiple? Why are people less likely to be a follower of my blog, if I post random things that I just happen to like?
I don't see the point to make a fandom based blog (which I'd like to do, I just don't think it'd get me any more followers) if there's a million out there just like mine.