loading speed impacts your SEO rankings so improving the loading speed of your website helps increase your SEO ranking. Adding featured snippets can work wonders when it comes the improving the ranking of your website. Under your main link if you add site links, this makes it easier for customers to visit the exact place they want to hence increasing the website SEO. The keywords you use for your website should be such that they have a high commercial intent and those keywords which get you featured and help u grow. If your website is not what the users want this would make it fall below in the rankings. However if u optimize old content according to the changing scenarios that will help improve SEO.