The backlinks that actually make a difference are those that come from credible sources that are related to your business and that can be trusted. In the case of law firms, they should be obtained from legal blogs, news sites, directories, and other relevant online sources.
For a detailed link building strategy, check out this guide on Attorney Rankings
Link building for law firms needs to be centered around guest blogging, creating quality content, and getting mentions through outreach activities. The result will be high-quality backlinks that help boost rankings and bring in targeted traffic for your website in a sustainable manner without using old and ineffective SEO practices.