Improving CTR for Business English in Tech Newsletter

Hi, our newsletter teaches business English for working in Tech - as our audience grows, we are struggling with declining CTRs. We would appreciate any advice, here is an example post: https://speaktechenglish.beehiiv.com/p/how-to-learn-english-fast

Biz F.
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I think the underline on the links are easy to miss-- they are light yellow-ish. Whereas underlines for Polls are clear. Would use a lighter blue for the Hubspot ad too. Or make it look the same as the other content so it appears less like an ad. Personally, I just use the standard blue with blue underline, not hard to miss. Or you can try your brand highlight color w/brand highlight underline too.