What type of sites require DIVERSIFIED LINKS ?

Hello ,

I have a site around 10 months old. Its ranking ok but there are not many links pointing to the site.

One of my friend told me that my site requires DIVERSIFIED LINKS . And he suggested me this service
https://www.blackhatworld.com/seo/s…-hq-pbn-social-signalsdiscount-inside.962598/

So i want to know why i require diversified links. Is so many low qualities links does not make it look spammy.

Or did my site really needs…

What type of sites require DIVERSIFIED LINKS ?