Should I remove old content that isn’t popular anymore?
If you have content that is no longer relevant, then you could look to re-direct it to content that is still current. You could update the content to make it more relevant and help it to become more popular. Or you could decide that some of your old content needs to be ‘no-indexed’ in Search Console and removed from your site altogether. Most of the time, you can do something better than simply deleting it.