Hey there! It's not uncommon for Domain Authority (DA) to remain stagnant even after you've made improvements to your site. DA is influenced by various factors, including the quality and quantity of backlinks, on-page SEO, and the overall domain history.
One possible reason for not seeing an immediate change could be that Moz hasn't updated its DA score recently. They don't update DA in real-time; it happens periodically. Additionally, keep in mind that DA is a comparative metric, meaning your score is relative to other websites. So, even if you're making improvements, if other sites in your niche are doing the same, your DA might not move.
Make sure you're focusing on acquiring high-quality backlinks and maintaining consistent on-page SEO practices. It can take time, but steady improvements should eventually reflect in your DA score.
For more detailed information, you might want to check out Moz's guide on Domain Authority.
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Hope this helps!