After a major adjustment, Google Ads has been showing a learning phase

Currently, there is a situation where it consistently appears during the learning period, with a noticeable decrease in click-throughs and no conve invested $20 in an advertising campaign, but it only generated $3 in revenue in one day, which really bothers me (•̥́ ˍ •̀ू)How should I proceed? I have been running this advertising campaign for over a month, and there have been 1-2 conversions before
Note: I am a newbie. This advertisement has been running since July. Can I get some help? The advertisement shows excellent effectiveness, with a quality score of 3/10. The relevance is not an issue, but the predicted click-through rate and landing page experience are both on the lower side. I've been troubled and don't know where to start to improve;