stuck on getting featured snippets

Are you already on page one for those queries? Snippets nearly always come from pages ranking in the top few results, so if you're on page two, that's the actual problem. If you are up there: put the question as a heading, then answer it directly in the very next paragraph, around 40-50 words, no lead-in. For list-style queries use a proper HTML list or table. Look at what currently holds the snippet and match its format, just answer it better.