Do you find the results are better when you use the same query on Google? Because I’ve also exclusively used DuckDuckGo for the past 5 or so years, and every now and then I get frustrated by the results try Google.
But only once did Google actually give me what I was looking for. Every other time the Google results were the same SEO garbage I was getting with DDG.
Maybe I should try switching to Google for a full month to see if my search quality generally improves.