How to get high quality backlinks?

Hi,

How do I get good quality backlinks?

I have reached out to several blogs and only a few have agreed to post a link on their site.

The problem is that most of the time they don’t support Dofollow links.

My question is:

is their a software or any other tool that can provide good backlinks to help me rank better?

Or what do you suggest?

Thanks!

//Fredrik