Q: Will these submissions really increase my SERPs?
A: Yes! Do note the above explanation, it takes time for the directory webmasters to approve your links and further for google to index them, so it would only be wise for you to supplement these submissions with your other SEO strategies to fasten the process. Make no mistake though, ranking depends on your competition and there’s no way you’re gonna rank for tough keywords (ex. health, finance) only with directory submissions.