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I understand your concern. Domain Authority (DA) and Domain Rating (DR) are different metrics, and they can change at different paces. While a high DR is a positive indicator, it doesn't guarantee an immediate increase in DA. Keep focusing on high-quality content and backlinks, and over time, you'll likely see your DA improve. Patience and consistency are key in the world of SEO. 
I am facing the same issue on my site I think we can make more high-authority links to increase our site's DA. Because backlinks are most important to increase site DA
To improve your Domain Authority (DA), focus on quality backlinks, high-quality content, on-page SEO, and a strong social media presence.