Let's Encrypt is an SSL provider. That means, they can make your HTTP website into a HTTPS website. This will have an impact on your Google ranking as well.
Let's Encrypt is free and web panels like cPanel allow you to add Let's Encrypt SSL to your domain in a few clicks. One of the main reason why we use SSL is to prevent man in the middle attack. Consider your website has a login method to get into the account. Your end is safe and the server is safe. But someone in the middle might hack into the stream between your PC and server and get your password. This is why SSL is very important, Google values it or not.
If you haven't added HTTPS to your website, it is better you do that now.