Search engines like Google frequently update their algorithms to improve search results.These updates can sometimes cause fluctuations in rankings, even for websites that haven't made any changes.
A sudden loss of backlinks or an influx of low-quality backlinks can harm your ranking. Regularly audit your backlinks and disavow any that are harmful.
The online landscape is constantly changing, and your competitors might have made improvements to their websites that have pushed yours down in the rankings.
If your site violates search engine guidelines (e.g., keyword stuffing, cloaking), you might receive a penalty, causing your rankings to drop.