Hello Stranger!
Well, it all depends to how you are collecting your backlinks at the moment:
**Paid backlinks:** spend more, go through an Agency that has a decent publishers portfolio, target partners with a higher DR/AR/TF/CF/You name it when you collaborate with them.
**Organic backlinks:** create more shareable and interesting content in order to supercharge your outreach strategy toward media, digital PR people, blogs…
For more details, check one of the many guides out there, on Google, done by SEO tools or Outreach Experts.