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I have the same issue with my site that sales bubble tea counter.

Domain authority takes time to improve as you continue to publish high-quality content consistently over many months. Keep up the good work and you should see gradual progress. One metric alone doesn't tell the full story. Track other signals like traffic, rankings, time on page. As long as those improve, your content is doing its job even if DA plateaus for now. Be patient. Significant DA gains usually take 6-12 months minimum of ongoing effort. Stay consistent with publishing and keep optimizing for users rather than short-term algorithm wins. The authority will come.