These days, you have to go out and get links… do the “leg work” or hire someone to do it. If you get caught up in a link-farm scandal now, Google may never allow you to recover and then your brand is dead. You get to start all over. Maybe a good first step would be to get on Buzzsumo and find some of the key or 2nd tier “influencers” in your vertical and ask them if you can write a guest blog post or have them do one for you. Guest blogging isn’t as popular or give as much “lift” as it used to, but it may be worth researching for your market(s).
Just my 2¢.
Good Luck!
~B.