How best to get backlinks for a physiotherapy website

[Josephysio]

Hi, I'm trying to get around building a backlink profile for my website, to build domain authority on Google.
Would appreciate any tips and offers in this regard. I'm open to guestposts, exchanges. Im told that links from same niche websites matter more. My website DA is currently 20+, so hopefully looking for similar or higher DAs. Here's my link www.stjosephsphysio.com

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