Bad links eat up the domain authority sooner or later. It happened to me when I was a novice. After I realized the culprit, I removed all bad links and my domain authority jumps up insanely in the next indexing. Bad links will make your ranking drop down .

Generate quality links instead. Keep your link profile neat. All this won't let your position go down in search engine result pages.

There are tools to disavow bad links such as Google Disavow Tool.