how do i get high quality backlinks properly?

Quality mostly means relevant and real: a site in or near your industry, that has its own traffic, linking from a page someone would actually read. A big DR number on a site that sells guest posts to anyone is not that. The properly part is earning rather than buying - being quoted as a source (answer journalist requests in your field), getting listed by partners and suppliers you already work with, local associations if you're a local business. Slow, but none of it disappears in the next update.