Unable to change default search

I recently changed my default search engine to DuckDuckGo. Today, I’m unable to revert back to my original search engine which was Google. Additionally, I cannot change from DuckDuckGo at all. The drop-down menu doesn’t have any choices and I cannot create one manually.

check this https://support.brave.com/hc/en-us/articles/360017479752-How-do-I-set-my-default-search-engine-

hope it help and have a nice day

No, I already tried that. It won’t work for me.

then open google.com or any search engine you like in new tab and search for anything on it then wait a little then go to setting then Search engine then Manage search engines
you will find google on the list down side then click on the 3 vertical dot then set as default

hope that help and have a nice day