Should I Niche From the Getgo?

Sandyak friends and comforto yan clero here right now, not yo im doggy that way. Let's talk about the niche, because a lot of copywriters say to me, should i niche from the getgo? And if i do, how, because i don't have any niche to speak of, other than, may be the background that i've had. I always encourage people to think about their niche firstly, rather than specific industries. If yout overlay all the bits about yourself, there will be a little bit that intersec and that is your nich now.