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I think you should wait around 3-6 months after the initial optimization you performed. However, the rate of growth can vary depending on the quality of the backlinks you acquire. My advice is to avoid low-quality backlinks that provide little information.

In my experience, optimizing this page has gone well:

https://www.globalsevilla.org/international-school-in-jakarta

I avoided over-optimization to keep it as natural as possible.

I have a case where a website did not show any increase in spam score, even after I performed off-page optimization on the website. However, the method I used involved optimizing one of the landing pages, such as the example URL that pointed to keyword international school jakarta

I believe that with good content quality and an off-page strategy using well-crafted content without forcing results, it leads to good outcomes.

Disavowing links might help, but I agree with those who say it's more important to focus on the quality of your content than on the number of links you have.