There is no shortcut that survives. What exists is a short list of things that work, ordered by how much work each one costs you.
1. The links you could already have
Before looking for strangers, look at who already knows you:
- suppliers who list the businesses that resell them;
- customers who talk about who serves them;
- trade associations and chambers you belong to;
- partners you already work with.
These are the easiest links in the world and almost nobody asks for them.
2. Directories and search sites in your field
A listing in a directory read by people in your industry is worth more than ten links from generic sites. It is also the most repeatable path: it does not depend on anyone liking you.
3. Content worth citing
Something only yours: a number you measured, a comparison nobody had made, a guide that saves someone an afternoon. It is the slowest route and the only one that keeps producing links after you stop.
4. Content partnerships
Writing for someone else’s audience, and having them write for yours. Works well between businesses that serve the same customer without competing.
What to avoid
Buying links in bulk, exchanging links in circles, and comment sections. All three are patterns search engines learned to spot long ago, and all three put at risk exactly what you are trying to build.