I have read a few articles that say indicating a language per webpage with hreflang really only helps sites that use multiple languages. Although my site is only in English, I see that it is ranking for a few foreign language keywords in Google Search Console (not sure exact traffic but roughly 15% of visitors from Search are non English preferred). My thought is that indicating language will help my single-language site because it will weed out the non-english speakers who are probably bouncing from the site. Overall I am thinking it might improve the quality of my search traffic. Do you think my logic is sound, or is adding hreflang not beneficial to my site? All feedback welcomed. Thanks!

I'm not sure if I should be including old URLs (content) that are being redirected (301) to new URLs (content) in my sitemap.xml. Does anyone know if it is best to include or leave out 301ed URLs in a xml sitemap?