Unfortunately, there's no magic number. It depends on a whole bunch of factors like how competitive your industry is, how long your website has been around, and what kind of links you're getting. I believe DA also plays a role in this.
But as a rule of thumb, experts suggest aiming for at least 50 high-quality backlinks from reputable sites in your niche. Of course, this isn't a one-size-fits-all solution - your specific situation might require more or less.
Now, before you start scrambling to get any old link from any old site, hold up! Not all backlinks are created equal. You want to focus on getting high-quality links from trustworthy sources in your industry. Websites that has been around for a long time, building up a good and honest reputation. These links will not only help you rank higher on search engines, but also bring in targeted traffic that's actually interested in what you're offering.
So, in summary, building backlinks is a super important part of your online marketing strategy, but it's not about quantity - it's all about quality. So focus on getting those top-notch links from reputable sites in your niche, and watch your SEO game skyrocket!