Hi good day sir! Domain Authority(DA) is a search engine ranking develop by Moz. This ranking score system ranges from 1 to 100 the higher the better. So how will a certain website boost it's Domain Authority(DA) rank? It depends how well a certain website rank up in a search engine. So therefore if you want to boost your website Domain Authority(DA), you must optimized well your website. A smoother, faster, a user-friendly and a responsive website. More page views over bounce rate, and only Organic SEO no Black hat.